what if Unohana kicks his ass... but by getting his ass kicked he learns to talk with his Zanpaktou, this gives him his Shikai powers (finally) and helps him to be useful in the upcoming fight with the Stern Ritter.... Except that DURING his fight with the stern ritter, he gets his ass kicked aaggaaiinn.... But this time descovers his Bankai. The problem is, with his Bankai unlocked he goes a bit.... Native, and after kicking the Stern Ritter back to Quincy Hell, declares himself the head of soul society, tries to take over and has to be stopped by his former friends..
Thus it all goes full circle and Zaraki Kenpachi, the first real "Boss" fight of Bleach, becomes the LAST real Boss fight of Bleach as well