Well, let's look at the sequence Paul describes in Galatians, off the top of my head:
1. Paul has his revelation (in whatever form that may have come.)
2. Paul goes for three years into Arabia to preach. He explicitly mentions that he did NOT consult with anyone about it before going into Arabia.
3. Paul goes to Damascus. We don't know how long he stayed there, but obviously enough to be enough of a nuisance that the king personally dispatches troops to essentially besiege his own city to catch Paul. I'm guessing it took more than a day
4. Paul goes to Jerusalem, stays with Peter for two weeks, meets James too. Conspicuously enough, although part of what Paul is conveying is that eventually he did get confirmation from those too, he mentions it at step 6, but not here. Apparently at this point, Paul didn't feel a need to ask anything about Jesus, and Peter wasn't telling him anything. (Then again, if Paul used to persecute Christians and is the guy who instigated Stephen's execution, Peter may have good reasons to keep his mouth shut.)
(Just for the record, some argue that this whole trip to Jerusalem may be a later interpolation. I mentioned this in the other thread. I'm not going to go into that here, since it's not really important for what I'm trying to say. So let's assume Paul did go there.)
5. Paul buggers off abroad for fourteen years.
6. Paul goes back to Jerusalem because another revelation told him to (his speaking to ghostly Jesus was not a one-time thing), and FINALLY runs his story past some random people. (No, seriously, he conspicuously feels a need to mention that he didn't care if they actually had the authority or anything.)
Well, anyway, between #1 and #6, that's almost two decades of Paul preaching and starting churches all over the place. I'd think by that point it's too late to change the major points of his religion, no matter whether he gets them by cold reading or otherwise. You don't go to your churches after 17 years and tell them, "Guys, pay attention because this is important: it was actually Jesus not Bigus Dickus, and he was crucified, not drowned. But I figure we can still keep the cool fish symbols."
ETA:
That said, IF we believe Acts about it (and it's a big IF,) Paul did kind of omit most details when speaking to the Jerusalem group. E.g., his initial asking for permission to preach to Gentiles leaves one more with the impression that James was thinking he's just going to tell Gentiles about the Noahide laws for Gentiles... and then Paul forgets to actually convey even those restrictions. E.g., he doesn't tell James too that Jews don't have to obey the Law any more, but is perfectly willing to go through with a Jewish purification ritual to appear like an observant Jew to James.
Though in all fairness, Paul may not be deceiving
only the Jerusalem church. Even to the Gentiles, according to Acts, let's just say that to a group of Pagan Greeks he tells a fundamentally different story than what he was telling his church in an epistle.
At any rate, even according to Paul, he didn't get anything from humans, so even without Acts, he might not have gone in depth into exactly what his beliefs are vs what Peter's beliefs are.
Which kinda makes me just wonder, in the wise words of Daffy Duck, "Was this trip really necessary?" Exactly why does Paul only now want some confirmation? It's clear he could preach just fine for many years without caring if Peter or James have anything to add. And if he does want confirmation, then why does he not do it right? What was the point of all that?