Originally posted by Skybreaker
I'm not sure how Windu will handle sorcery; I find it very unlikely that he, as the previous grandmaster, has never taken any precautions against them (we do know that Yoda has). In a conventional confrontation, there's no indication that these two would have taken Sidious, together or no.
You don't need to be Sidious level to beat Windu. Vapaad only gets him up to his opponents level, he still needs to actually beat them using his own skill and he's outmatched against two powerful Sith attacking him at once.