sesshomaru will win. this is because he has bakusaiga. if byakuya uses senbonzakura kageyoshi against bakusaiga. then bakusaiga will annihilate senbonzakura. if it was speed then it's hard to say. because sesshomaru is just as fast byakuya.
obviosly ichigi would win he beat kenpachi byakuya ulqiorra and aizen
I think Toshiro if he tries hard enough
Taking all things into consideration, I believe that Aizen would win due to his superior experience and power. actually byakuya would win if aizen didn't have complete hypnotis as a shikai, otherwise aizen wins Kyoraku Shunsui, the 8th captain can beat Byakuya as he had beaten Starrk, the 1st espada shunsui never actually "defeated stark" he was actually defeated by stark, he wouldn't last a chance against stark seeing as he is only second best to yamamoto head general, who has the same powerlevel as aizen and he didn't even defeat aizen
Sonic would win the fight, but sora would put in one hell of a fight.
John cena would win in a fist fight an 50 cent would win in a in a gun fight
I would win.
In an all-out fight (not race) a bear would win. In a race of speed, obviously the cheetah would win.
pacman would win and they are going to fight in may 2012
I think that Lady Gaga would win that fight!
In a fight, Confucius would win as Buddha is an enlightened pacifist and would not fight back.
chimp would win.....
a seal would win.