In addition to his bankai, Byakuya is observed using three techniques:
I think it was in battle with Hitsugaya's Reigai, though I'm not sure
while fighting Ichigo at Rukia's execution
in the same fight as above
Not only is this the largest number of Zanpakutō abilities that we have seen in one sword (I think), but each one of them seems more powerful than the last (and more powerful than his bankai!).
So what exactly are those three techniques? Why is Byakuya the only one in Bleach to have so many different techniques contained in his Zanpakutō?