immolo said:
Except he would never hit Aizen since he wouldn't know where Aizen was becuase of the perfect illusion that can trick every sense even reiutsu sensing. For example what Aizen did against Hitsugaya. I also don't beleive Aizen was really trying since he was positive of his own power. Also inhis fight against Sajin Komamura he does the same thing again kicks his ass with the black coffin attack. If your right about Byakuya than the Final Boss in the entire series would get easily beaten by Ichigo since Byakuya got his ass handed to him by Ichigo's hollow form which he now has a limited control over. Just think about how stupid that sentence sounds since I have already said the equivalent like 3 times.
Immolo, this isn't a computer game. Nor is it a friendly round of Rock/Paper/Scissors. Combat potential and ability are not measured in 'A beat B, and C beat A, so C is stronger than B.'
Ichigo nailed Byakuya because he surprised him with his Hollow abilities. Hollow Ichigo could probably get in a good hit against Aizen for the very same reason - namely, Aizen
wouldn't be expecting it.
However,
that does not mean that Ichigo is stronger than Byakuya or Aizen - they dwarf him in experience, technical expertise, in zanpakuto mastery, Kidou ability and in control of their powers. All Ichigo has going for him is his insane Reiatsu levels and his learning curve - and in time, that might prove to be more than enough.
As for Byakuya taking on Aizen - if Aizen is standing
within a fifty foot radius of Byakuya, he's going to die. There's no illusion that will protect anyone from ten thousand tiny blades cutting them into mincemeat. Ganjyu stated that Byakuya's Reiatsu was above even Kenpachi's, he regularly pulls kidou out of his ass without incantions, he's almost on Yoruichi's level when it comes to Shyunpo - he's a monster, and one that no sane man would take on unless, as here, he was already exhausted and wounded.
As far as the story idea - well, Ttestagr poked a pretty big hole in it, in that Urahara's not arriving any time soon. It's also a pretty abrupt ending to a rather impressive bad guy - but if that can be worked around, I'd give it a read, certainly.