If anything the spear in the side is proof that he was still alive. Dead bodies don't bleed.
The historiographical evidence for him dying on the cross is weak, IMO. And if he didn't die, then there was no resurrection, and phtuff! christianity disappears. So suggestions that he didn't die will be met with a barrage of "proofs", half of which do not have a scriptural base, and a further quarter rely on suppositions as to what the gospels meant.
