In addition to ruling out 1) coordinated conspiracies to lie, and 2) mass hallucinations, the other theory I tend to rule out is the claim that 3) the resurrection is a much later legendary account not published until seven decades after the fact.Agreed on all points including your aforementioned theory that Jesus didn't die on the cross.
There are written sources in 1 Corinthians that almost certainly show that the early Christian belief in the resurrection goes all the way back to the earliest days of the Jerusalem church, in the 30s AD.
That's not nearly enough time for legends to take root and propagate. The legends of King Arthur, Achilles, and Agamemnon are published at least 500 years after the men they might be very loosely based on lived.
The theory you and I have discussed is the only naturalistic explanation that doesn't invoke miracles, nor coordinated conspiracies, or implausible legends.