KWED
Scratching head, scratching knee
It is possible that a few people witnessed something that they believed was Jesus risen from the dead. However, we cannot know for certain.At this point I am not claiming that early Christians saw an actual resurrection, just that they saw something that they interpreted as an actual resurrection. …………. Whether if it was a real resurrection / a hallucination / Jesus never died and fuelled everybody / Jesus had a tween brother or any hypothesis that you might have is a different discussion.
Given this lack of knowledge, the lack of any independent corroborative evidence, the existing belief that such an event was required to fulfil prophesy, and the impossibility of the event, it is unreasonable to insist that it did happen, or even that it probably happened.