He had taken some kind of paralyzing drug that wore off later. He appeared to be dead, but later his friends got him out of the tomb and led him far away to live out the rest of his life. The Roman guard said he was dead. They were efficient and sell trained and they knew what dead meant. If the disciples were in on this plot, again, why would they die for a hoax.
Secrets always leak out.
Don't give me your feeble psychobiography. There is only one other possible explanation. One that needs to be examined seriously. Jesus rose from the dead exactly as the gospels said he did. If you go home and read all 4 gospel accounts of the resurrection today you will find 4 somewhat different stories- some of little details don't fit with each other.