Buckbeard is no "materialization" of zangetsu. It's just a coincidence. Stop being stupid and saying it is on every thread. and if it turns out he is in some sort of relation with zangetsu, don't brag "I told you so!" or some stupid thing like that, you'll look even more dumb.
So about this chapter and what i hope to God will happen later; The Vandereich are going to infiltrate Soul Society? Things are going to get awesome. A shinigami will die, or get fatally injured. I hope the rest of the vizards come into play soon. Kubo needs to make this arc stretch with epic 2 chapter long battles of each captain releasing their bankais, not instantly, but they must release it. But what would make it really good is if they kill off 2-4 captains, and then Soul Society comes back with a bang (Squad Zero). It would also be a good arc if isshin dies before he speaks of his history, only for someone in squad zero to let ichigo in on the truth of his history, only to make it more of an epic story. Uryuu should go on the Vandereich side, and act as a mole until the very end (pulling a Gin, but actually causing damage like killing off a huge amount of their "captains"). Point is, every last thing must put the characters through an intense form of hell only to fuel them to get out of it, make them use last resort abilities and to call in for last resort assistance (arrancar and squad zero).