The key part is that Jesus appears to him as a vision, and he counts this as equal to the other appearances.
This may just be Paul aggrandizing his position, but, to simply never mention the tomb gives us the idea that it was probably became a central theme only later.
Yes, I think it is equal. He seems to have had a vision of Jesus in bodily form. But he indicates it is different in kind to the others by the phrase "as to one abnormally born", and the Acts account also shows it is different from the others, but no less valid. But there is no reason to suppose that all the resurrection appearances were of that form, otherwise the differences would not be identified.
I think your claim that this shows the accounts were invented later is speculating far beyond the available evidence, and the suggestion that the tomb accounts are early makes more sense.
If the first mention of it came after the Council of Nicaea I might doubt that they were aware the narrative too.
You might. But you are assuming that the first mention comes later than Paul. First off, we don't know when Mark was written; it could have been early. Second, whenever it was written, it was almost certainly drawing from long-standing oral tradition, as Paul himself was.
We don't know that any "eyewitnesses" were met. Mark actually said the "eyewitnesses" to the tomb story didn't tell anyone.
The fact that he is writing the account shows that he does not mean that they never told anyone ever.
Richard Bauckham has done some good work showing that the accounts of Jesus in the gospels were probably related by the people who are the main characters in each story. Moreover, if Luke was in Jerusalem, and he was the kind of person who would gather together different evidence in order to put together an orderly account, I think it very likely he would have spoken with the eyewitnesses in Jerusalem about what they saw.
To suggest that no one in the Paul camp wrote the Gospels is a bit odd if you are also assuming Mark and Luke are close associates of his.
No, I was rebutting your claim that the empty tomb accounts originated in Pauline Christianity. If they had not been true, there is little reason to suppose that Pauline Christianity would have invented them.
Besides, I am suggesting that the people Mark and Luke were using as sources were probably the ones inventing or distorting this story not Paul himself or his associates.
Why should you suppose that? You need some evidence before you accuse people of lying.
The methodology suggested for the synoptic gospels is that they are using mostly the same source material and copying Mark, which means them agreeing at any date is by no means interesting.
Yes, but the interesting thing about the resurrection accounts is that they are
different from each other, yet still agree. There are plenty of things in Matthew and Luke that are copied from Mark pretty much verbatim, but the resurrection accounts are not. Moreover, John too, which has very little overlapping material from the synoptics, also has a resurrection account which bears out the other three.
If they were made up, you would either expect them to be identical in their details, or to have substantial disagreements. That they are different yet still in agreement makes them look much more like eyewitness testimony.
Roonwit