Kanic said:
Yamamoto acknowldged him as Juha Bach, but he says he isn't. Sooo, an illusion(again?) or some kind of clone? SO, I think we have a hint about the war potentials. People whose Bankai is of unknown potential.
So: Ichigo, Kenpachi, Yamamoto, 4th one is???IF war potentials are people whose Bankai can't be stolen then Renji would fit, he got his bankai not long before Ichigo and if you noticed Kubo made that Quincy's stupidity as a reason for not showing Renji's bankai. The 5th could be Aizen, since his bankai.. wait what was Aizen's bankai? I don't think we saw his Bankai, so that could be it.