Re: Bleach 529
I don't think Isshin was defeated twice. I'm guessing he fends off whatever is going on in Narukishi City (unless this is the actual place that Masaki rescues him), and Aizen actually sends more or himself after Isshin.
I can't remember, was it ever stated that Gin had a hollowfication side or not? I don't remember seeing that in the Aizen arc.