Yes of course. Sorry to hear you are sick. Always love to converse with one of the few smart people at the forum. Get better.
Now back to the discussion. There are a number of odd things about this section of text. We'll start with the obvious.
There seems to have been two distinct early Christian interpretations of the Passion and its relationship with the prophetic writings. On the one hand, our analysis (or my analysis) shows that there was a POV - perhaps identified tentatively with 'Marcion' that said 'yes' to the Passion being reflective of 'future' apocalyptic/messianic scenario painted by Isaiah 53 and 'no' to the addition of Psalms 22:18. I know that sounds crazy. We have been led to believe that the Marcionites denied the prophets as such. But it is well established by Williams and others that when you actually go through Tertullian's Adv Marc especially Book 5 which deals with the Pauline corpus at least some of the allusions to the prophetic writings and Isaiah in particular are 'retained' (the other way to look at it - my way of looking at it - is that the selective use of prophetic scriptures was massively expanded in the Catholic canon to include many if not most of the present allusions to various scriptural writings much like we see with the expansion of the Ignatian corpus from the Syriac 'short' letters to the longer Greek and then to the longest (universally acknowledge 'forged' or adulterated) 'long' text of the Greek.
For those who aren't familiar with Tertullian's attack against Marcion along these lines from Adv Marc 5 let me give one famous example cited by Williams dealing with the 'end' of Romans and its 'retention' of Isaiah:
Hence then the exclamation, O the depth of the riches and wisdom of God, the God whose treasures were now laid open. That is Isaiah's: and what follows is from that same prophet's indenture: For who hath known the mind of the Lord, or who hath been his counsellor? Who hath offered a gift to him, and it shall be recompensed to him again ?g When you took away so much from the scriptures, why did you retain this, as though this too were not the Creator's? [Adv Marc 5.14]
So as Williams as other noted, Tertullian's original charge that Marcion 'erased' things to separate the Law and the Gospel is more complex than usually acknowledged. Apparently at least some of the references to Isaiah 'stayed put' - i.e. that the apostle frequently or at least sometimes alluded to Isaiah even in the Marcionite canon. Most of the other references to OT scripture was not there. So you had from the Marcionite perspective, a New Testament canon entirely written by Paul and Paul making allusions only to Isaiah (or perhaps a small number of other prophets but I don't think so - I only think it was Isaiah and only some of the Isaiah references that currently stand) and the orthodox position epitomized by Tertullian who says elsewhere in the same text that the Marcionites left in 'some' allusions to the OT in order to confuse the orthodox!
Obviously Tertullian's argument is stupid. There was a version of the New Testament which either only made reference to Isaiah (and then only a small number of references) which was later identified as 'Marcionite.' For some reason Isaiah was 'cool' according to the Marcionites. But why?
Let's stop for a moment and consider the absurdity of the Catholic position. Tertullian and Irenaeus before him say that there was only one 'Jewish god' (not a number of different powers in heaven) and they all spoke to the 'Jewish prophets' together as some sort of 'prophetic assembly' throughout time. These 'Jewish prophets' (i.e. Moses through to John the Baptist) were all 'for' the Creator, i.e. the Jewish god and the Marcionite position is absurd because it argued that Jesus was hostile to the temple, wanted it destroyed and with it the sacrificial religion of Israel which it 'hated.'
The idea here is 'monarchical.' In other words, there was one God and he spoke with one voice to one 'prophetic body' to one people (= Israel). But surely no one can be so stupid as to argue that Moses was 'for' the temple. Nowhere in the Torah is it argued that a physical building (i.e. with a roof) is necessary to stand in God's favor. Moses's position is that you set up a temporary tabernacle which moves around in the desert until presumably the Israelites get to Gerizim where they would presumably set up a similar tent.
Now here is where it gets interesting. Isaiah is well recognized in the literature as being a prophet hoping that the first temple would be destroyed. He is the mouthpiece of various antinomian statements in the literature related to the Ascension of Isaiah. So the idea that the Marcionites might have 'liked' Isaiah isn't all that crazy and in fact is confirmed by the presence of Isaiah in their exclusively Pauline canon.
So now we return to our original discussion about the identification of the Passion 'conforming' to the vision laid out by Isaiah in chapter 53. Could this too have been a Marcionite position? I think so. If Isaiah appeared approvingly in Paul's letters then it would stand to reason that the Marcionites could well have acknowledged that Isaiah knew or at least gave an imperfect outline of what would happen at the Passion.
So here is where things get interesting again. The only thing that Tertullian consistently states is that the Marcionites argued that Psalm 22:18 was an addition to the 'true gospel' Passion narrative which we have just seen could plausibly have 'mirrored' Isaiah chapter 53 - even for the Marcionites. So now immediately we see that our idea of a later addition to Adv Marc chapter 4's discussion of Passion - one which features Jesus being sent by Pilate to Herod - is quite significant.
There are in fact two different discussions going on within the existing narrative. As I have outlined above, the original text had both the author (not Tertullian but his source) about the implications of a mutually agreed upon borrowing or mirroring of Isaiah 53. Now the original author said (by fusing the arguments in this section with those in Adv Iud 10 and Adv Marc 3.19) that every aspect of the narrative was there. The existence of a 'war captive' (= Christ), his suffering, that his life was given for many, the empty tomb and most importantly verse 12 which speaks about his soul or spirit being divided among the people. There is an underlying sense too that those who judged the suffering servant would be judged.
All of this the Marcionites and their critic agreed. There were clearly different ways of interpreting this general understanding but the big issue seems to have been the addition of Psalm 22:18 (explicitly in Matthew and John) and implicitly 'And they divided up his clothes by casting lots' in Luke and Mark. The Marcionite gospel clearly did not have any reference to Jesus 'really' having clothes which were divided by the soldiers, no reference to Psalm 22.18.
This idea is supported by examining the strange way that Mark and Luke disagree with one another. In Mark, the soldiers put the robe on Jesus to make him look like a mock king in Luke Jesus gets the robe from his visit to Herod (strengthening the kingly allusion because he gets the garment from a king). But these are all mere set ups for the presence of 'clothes' which can be divided up by the soldiers to fulfill Psalm 22.18 (even if it wasn't mentioned explicitly).
Now the Marcionites denied both Mark's reconstruction and Matthew's addition of the Psalm:
Evidently the statement that his raiment was divided among the soldiers and partly assigned by lot, has been excised by Marcion, because he had in mind the prophecy of the psalm, They parted my garments among them, and upon my vesture did they cast lots.g So he will have to excise the Cross as well, for the same psalm is not silent about it: They pierced my hands and my feet.[Adv Mark 4.42]
But clearly the tone of Tertullian's attack confirms that they acknowledged an underlying indebtedness or mirroring of Isaiah 53. But we shouldn't lose sight of the most important thing.
Luke could only have had the editorial liberty to reconstruct an alternative origin for the presence of clothing which the solider divided if it knew of an earlier gospel - the Marcionite gospel - which had absolutely no reference to the dividing of clothing. In other words, Luke was not entirely dependent on Mark but on ur-Mark that is the Marcionite gospel which stood behind Mark and Luke's separate reconstructions of the giving of clothing to Jesus to accord with scripture.
Notice also that the cited gospel in Adv Marc differs on the question asked by Pilate too - Pilate's question was 'Art thou the King of the Jews?': the chief priests
asked, 'Art thou the Christ?'—Luke 22: 66. In the gospel debated by Tertullian's source and the Marcionites we read:
So when they had led him to Pilate they began to accuse him of saying he was Christ a king, meaning no doubt the Son of God, who was to sit at God's right hand. Surely they would have arraigned him under some other charge, being in doubt whether he had said he was the Son of God, if he had not by the statement Ye say it, indicated that he was what they said. Also when Pilate asked, Art thou the Christ? he answered again Thou sayest it, so that he might not seem, through fear of the authority, to have refused to answer
In other words the Marcionites said Jesus was the Son of God, not the Messiah. In Luke he specifically asks Jesus “Are you the king of the Jews?” to which Jesus gives his oblique reply “You have said so." But in the gospel of Tertullian's source and the Marcionites presumably he obliquely avoids acknowledging himself as the Christ? Why?
I think 'king of the Jews' = king Judas. The Catholic editor wants this idea to be stamped out not his association with the Christ.