My apologies but I don't quite follow your point here.
You think the fact that Paul alluded to the crucifixion in the time frame of Pilate is strong evidence that the author of Mark used Paul (directly or indirectly) as a source and made up the connection between Pilate and the crucifixion based on Paul's information on when the HJ died?
Well that’s not
quite how I put it. What I’ve said is that the writing attributed to Paul is clearly a source from which later Christians could have concluded that Paul’s vision of the risen Jesus meant that Jesus had been executed and risen close to the date of Paul’s vision. Which would put the execution at the time when Pilate was the governor of Judea.
Against that, what Craig is saying (he can correct this if I misunderstand him), is that the canonical gospels might not have got that idea from that earlier writing of Paul, but instead from having eye-witnesses who actually claimed to see the execution.
But that is a complete speculation, which also attempts to justify a real-HJ by saying there were actually eye-witnesses to the execution.
I don’t know of any basis or any evidence to allow a speculation like that at all.
However, on the other hand, if as I think everyone agrees, Paul’s letters pre-date the gospels, then those letters are quite obviously a source from which later writers (such as whoever wrote the extant copies of the gospels, which actually date from 4th century and later), may have got the idea that the execution of Jesus, and Paul’s vision of that, had taken place around 30-36AD during the reign of Pilate.
And as a piece of additional support for that, it turns out that a slightly later, but still very early letter from “Paul”, known as First-Timothy, actually names Pilate as the Judge in the trial of Jesus.
Now those Letters from Paul are not speculation. They do not need us to speculate about unknown un-evidenced eye-witnesses. Because they apparently actually exist saying that Paul had seen a vision of the risen Jesus at the time when Pilate was governor of that region.
Keep in mind here that although bible scholars like to quote very early dates for the first gospels, eg saying Mark dated originally from about 70AD, in fact it seems that the first relatively complete and readable copies of any of the canonical gospels date from at least the 4th century, and mostly from the 6th century and later. There are some fragmented pieces of gospels which are thought to be earlier than that, but unless by some miracle any of those fragments actually have a sentence saying that Pilate executed Jesus, then we are relying on what was written about Pilate in gospel copies that probably date from at least the 4th to 6th century or later, and that is a very long time after Paul and his followers were preaching about those visions of the risen Jesus in the period up to Paul's death c.65AD.