Yes, I think that it is a weak argument by Vinzent to emphasize the presence of sadducees and not of the scribes in the Jesus's answer.Its too trusting of Tertullian to think that Marcion really had the scribes praising what Jesus said against the Sadducees. Since, obviously, if Jesus had said that each age has its own god, the scribes wouldn't praise that. The scribes praising the answer is Luke's invention, once he has changed the answer to support the Pharisaic version of the resurrection. Also, why would only Sadducees be targets of Marcion's polemic? That would only make sense if Pharisees didn't exist yet. If both Sadducees and Pharisees existed, then teaching two gods would make both of them polemical targets. Tertullian is not dealing straightforward with the text.
But even so, I think that the ''enigma'' put by the sadducees is too much ridicolous even if the sadducees did mean it seriously. In Paul, the ''enigma'' put by the his opponents is too much ridicolous when they did ask: ''But someone will ask, “How are the dead raised? With what kind of body will they come?” How foolish!'' (verse 35).
The argument in Paul and in Mcn is that it is foolish to meditate about the nature (or the marriage affairs) of the risen bodies, since the our future bodies will be not more the our physical bodies, but entirely spiritual, ''like the angels in heaven''.
It seems an argument pro Mcn priority.