Originally posted by General Kaliero
Ooh, look, wild baseless illogic.
It really isn't baseless logic, considering on the official AC accounts, even from Square Enix themselves, Sephiroth appeared only to torture Cloud on a mental note and mess around with him, not flat out destroy Cloud.
In fact, Square-Enix has even stated that Sephiroth not once Pre-Nimbleheim, FFVII, and AC did he ever exert his full strength. Meaning, Sephiroth throughout all this time has been holding back and has never show cased his absolute full power, so his true full strength still remains a massive mystery.
The fact is simple, it has been stated that Sephiroth is the single most powerful being in the Final Fantasy VII Universe, the mere fact that he survives death pretty much says it to you and me.
Sephiroth doesn't "defeat" Cloud simply due to plot devices (how stupid would it be if the hero loses in the game...yes, that would be fun spending countless hours in a game only to see a bad ending), not to mention Sephiroth would rather toy with Cloud and try to break him down mentally then outright blow him out psychically, because if Sephiroth wanted to kill Cloud, he could easily do it.
Although I feel that Pyron would win, simply due to the fact that we have been able to gauge Pyron's powers which are on borderline ridiculous, Sephiroth should absolutely not be underrated, because he has never fought at his full potential, so again gauging Sephiroth on his abilities will simply become theory from here on out, until Square-Enix either officially confirms what his full potential is, or makes another Post-FFVII w/e showcasing Sephiroth with his full potential.