Is it possible that it's hollow Ichigo? I mean, did Kubo ever state that the hollow part of Ichigo is gone? Ichigo could have raged so hard because he heard everyone suffering and he went hollow mode, broke out of that prison, and destroyed him?
There's quite a few possibilities. Most likely it's Grimmjiow. After Ichigo defeated him I think all he did was "train" to get power so he should be much more stronger. He's the right amount of "evil" to point his sword at Urahara yet not kill him. And it's in HM. I just hope it's not a new unknown character. Though the fact that Urahara was so stunned could mean he knew the person well. It can't be Ishin since he wouldn't point his sword at Urahara. I doubt Aizen escaped yet. Maybe it's Gin? lol
