Wouldn't mastery be Bankai though? I mean Ichigo had to fight Zangetsu in order to get Bankai. He also had to fight Hollow Ichigo in order to master Visored powers. And when Tensa zangetsu said good buy, he was still in merged form, which leads me to believe that the merge was permanent. I mean it'd be awesome if he still had half his powers already, but wouldn't that let him see hollows, as well as Hollowfy?
Bleach is a great story and all (most of the time) but Kubo leaves waaaaayyyy too many holes. Most he forgets to fill up again.
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