Alex.J
[14] Master
I looked up something to prove Aizen superiority and found this. Everyone in anime loses.
G Gundam being in there made me laugh a little. Claire from Claymore being in there is also funny. Since she doesn't even beat the person she swore an oath to kill.
But at the height of his power, Aizen was literately one of the most broke characters to exist in cartoons. Like Thanos with the infinity gauntlet broke. Honestly Aizen could just trick the good guys and make them fight themselves. I also think Aizen thrives on big group battles unlike most the other people fighting. Since his power of illusion only gets stronger with more people around him.