Originally Posted by Gamabunta
Those who think he is part of zero squad, what merits earn him a spot?? No offense if he's your favorite but this chapter shows he's weak... Though i will have to agree if being the first to fuck a quincy place him there.
How about the fact that he flicked Aizen with a finger and sent the dude flying? To say this chapter shows that he is weak could be jumping to a conclusion.
We've already seen that Isshin knows about the Final Getsuga Tenshou and what it does to the user. Nothing has been implied yet, but looking at the evidence that kael produced... he was Zero squad, 7th division captain, or Kubo just fucked everything up like Kishi did with the Obito flashback (which is a viable possibility). We know Isshin was a captain/captain level.
It doesn't take much to do the math.