Oh man see now but you're now involving Cloud Strife, which you just can't really do when comparing to the Marvel guys. First Cloud has the Buster Sword which in turn well owned life. Second of all Cloud also has magic both dark and white. So he can call forth things like Meteo. Then he also took on Sephiroth which owns Bahamut and all the Marvel guys.
Cloud is Cloud. So I dunno if he'd be a good guy to compare to.
As for the changes. Johnny Storm helps out a lot more than Doc Ock so good call there, but once again Bahamut withstands all kinds of crazy shit at the hands people more effective than what Marvel has to offer.
GG is very agile in the air, but the wind from Bahmut's wing's alone might **** his glider up. And bombs don't really do much to him anyway. As for Spider-Man's webbing of the wings... once again he'd just break out that shit... not to mention they let him walk on his hind legs and use hsi arms in this one which makes it even worse. Cyclops, and Johnny are really the only thing that would draw the matchout.