What if:
1) the Jesus figure was unique insofar he and he only did the act of redemption,
2) who posed as him was rejected just for a such act of explicit co-optation of the Jesus figure
The only way to derive power and authority from a such figure who is so powerful (for 1) and in the same time is condemned to have not people posing as him (for 2), is to invent an entire not-life on the earth for a such figure.
Just what "Mark" did.
Another possible reason why "Mark" euhemerized Jesus
Another possible reason why "Mark" euhemerized Jesus
Nihil enim in speciem fallacius est quam prava religio. -Liv. xxxix. 16.