First sorry if someone else has already posted this, but I searched around and couldn't find anything so here I go. We saw earlier in this arc that when they tried to steal Ichigo's bankai that it did not work. However, we were never really told why, there was just speculation. Now with all the stuff that has come out about how Zangestu wasn't really Zangestu, but was his quincy powers etc... could it stand to reason that the reason they failed to steal his Bankai was that it wasn't really a bankai in the first place? Furthermore, since his new dual swords thing is now a true Zanpaktou, does that mean it could be possibly be stolen if/when he attempts to use Bankai?