I don't agree with FBR's conclusion for a number of reasons.
#1) He does nothing, as far as I have been able to see in these threads (since I haven't read his book), to address the literary nature of the Gospel narratives, especially Mark. There are numerous signs, from beginning to end in Mark, the the writer himself is inventing this story. It seems that FBR thinks that this is an "extreme" position to take.
Never mind that the Crucifixion scene itself is clearly concocted from the Jewish scriptures, not from historical details, what about the implication of the writer of Mark having used Philo's
Against Flaccus as inspiration for his mock trial?
Firstly, we have to acknowledge that this writer has included many details that are provably ahistorical, such as the dividing of his clothes. So if we can see that the writer of the scene is inventing details from literary sources, such as the use of Psalm 22, then why would we think that any given detail is "authentic"?
In other words, if someone has set out to provide a "historical account" of the crucifixion, then they would not mix in clearly invented details. The fact that this writer is clearly inventing details for symbolic purposes means that this writer is not interested in providing a historical account, they are interested in crafting a symbolic narrative.
Obviously the sign "King of the Jews" has symbolic importance to the narrative and we know for sure that this writer is inventing symbolic details due to his use of scriptural allusions, which are so replete in the Gospel of Mark that nary a periscope can be identified that is not based on them.
What he's doing is like taking a Bug's Bunny cartoon and ignoring the absurdities of a talking rabbit, of people walking through holes drawn on walls, of characters suffering massive trauma and then going on like nothing happened, etc., and then saying, "But look, Elmer Fudd is driving a car. That's plausible. That could happen. So maybe this part of the story is true!"
#2) Secondly, he has said things that are just absurd, like saying, "the emergence of a tradition according to which there was a Roman initiative against him
could hardly have been a fabrication, since it would definitely damage Christian apologetic interests." To me this just shows a blatant lack of comprehension of this material.
FBR is suffering from the typical tunnel vision of theologians and apologists, who
assume that the writer of the first Gospel narrative, or any Gospel narrative, had the same perspective and agenda as later orthodox Christians. This is where this whole "criteria of embarrassment" nonsense comes from. The classic example is the issue of Peter abandoning Jesus. The apologetic view of this is that, "this must be true" because a Christian wouldn't have invented a claim that the most important disciple abandoned the Lord in his time of need! This claim is "embarrassing" to Christians, so they would only have included it if they had to because it was a known fact.
This is total nonsense, because it firstly
assumes that the person writing the narrative would have had the same agenda as the orthodox church fathers. But in fact, one can fairly easily see from analysis of the Gospel of Mark and the Pauline letters that the writer of the narrative we find in the Gospel of Mark was someone who was intentionally attempting to discredit Peter, or at the very least to reflect the tension found between Peter and Paul in the relationship between Peter and Jesus. So from the writer's perspective, the "embarrassment of Peter" was a literary goal. This narrative was written in order to set the stage for Paul to be recognized at the only legitimate apostle. And part of that story is related to Paul's knowledge of "Christ" vs. Peter's knowledge of "Jesus".
So the assumption of the agenda or perspective of the Gospel writers is entirely flawed.
And secondly, as I describe in another thread, many orthodox Christians invented many martyrdom stories in which Romans apprehended and executed Christians, such as Peter, Paul, Ignatius, etc., so the idea that a Christian writer would never "invent" a claim about a Christian figure being apprehended by the Romans is entirely baseless. We know for a fact that orthodox/proto-orthodox Christians invented dozens, if not hundreds, of such stories. So the whole line of reasoning is entirely without merit to begin with.
I find FBR's logic and arguments to be extremely lacking time and time again, and then he is so smug to trot out this "middle-wayism", claiming that what's he's doing in finding the "reasonable" middle ground between the two "extremes" of faith and skepticism. Give me a break