There is NO proof, that is pure speculation. I believe Jenova was/is far more powerful than you think.
Sure, but if she could survive that kind of punishment, then no amount of swords and fists would pose any kind of risk.
Cloud was mentally weaker, eh? Then why did he not break down under Jenova's influence like Sephiroth did?
He DID break down; he was directly manipulated many times.
Yes, and how come Sephiroth, unlike the many before him, was able to block himself off from being mako poisoned? Jenova.
That's exactly what I was arguing. Jenova's superhuman strength and resilience reinforced him.
Sit Cloud and Seph down for a sanity test, my moneys on Cloud. Let them fight hand to hand, my moneys still on Cloud. He justified both of these things in Nibelheim, and he is unbelievably stronger in present day.
There's a reason Sephiroth was acknowledged as the world's greatest soldier while Cloud failed to gain entry into SOLDIER.