Aizen Vs. Kurosaki Isshin

[Inalialethsala]

I was told that Isshin is the captain before of Aizen's squad during his time and that he was also the one who taught Aizen to become who Aizen is at present. I don't know.

But let's see who will win between these mysteriously strong captains for us.

[Seff vi Britannia]

We havent really seen Isshin fight, so this is silly. Aizen GMV.

[Undying]

Aizen.

I don't think Isshin has any defence against his shikai.