So you're basically saying their sources all had different versions of the same event.
Yep, since people see things from different angles, and remember different details of the same event. But similarities mixed in with the differences show they are describing the same event.
Like with the resurrection appearances: lots of differences, but also similarities, for example, when the women see Jesus, they try to touch him. This comes out in both Matthew, who says that they clasped his feet, and John, where Jesus says to Mary, "do not hold on to me". But as you say,
You aren't making a good case for the accuracy of the gospels.
Because they had already happened. It would be a fair bet they would be happening again.
Plus of course they might have been bigging up Jesus' powers ofd prophecy. There's nothing like putting a prophecy that has already been fulfilled into the mouth of your hero from the past to make them look like a really good prophet. The writer of Daniel did a pretty good job of it in about 164BC.
Are you happy to say that Daniel was canonized in 40 years, since a dead sea scrolls manuscript containing a small part of Daniel was dated to 125 BC?