prologos,
There are, as you rightly point out, many other elephants. As you say, questions are therefore raised about the accuracy or otherwise of other accounts in Acts. I only hinted at these when I commented on the biased objectives of the writers of Acts.
I shall think further on addressing the broader issue. With this Study, of course, I needed to confine the scope.
Have you read the other books of Acts that were circulating at the same time but did not make it into the NT canon?
I am not aware of any unity between Antioch and Jerusalem at any stage. I don't recall the page number, but "Crisis of Conscience" recalls a speech by Fred Franz about the Antioch and Jerusalem; there used to be a recording of that speech "somewhere" on YouTube. I have transcripts of parts of that speech on my computer which I could email you.
I see nothing in Paul's genuine writings that suggests any unity with Jerusalem. At one stage I was tempted to show that while the Acts 15 decree wrote about staying away from blood, Paul insisted that his followers drink Jesus' blood (1 Corinthians 11:23ff). And he said that he received that instruction directly (in a vision) from Jesus - thereby bypassing Jerusalem.
In a direct answer to your question regarding Stephen and Paul's involvement - let's say there is doubt. Another example is the differences between the missionary journeys and the accounts of them as given by Paul. Many Bible scholars disregard Acts.
The GB's claim to fame fades without Acts.
Doug