I think it's kinda interesting that only ichigo leans over to the vizard side unlike the rest of soul society. None of the captains or guardsmen have except maybe Aizen who experimented and is well aware of Ichigo's hollow transformation and probrably has his own waiting but wants to reach the true fusion of soul reaper and hollow, hence the obtainment of hogoyoukou to erase those boundaries.
Was it Ichigo's informal training and rush to bankai that brought about the hollow and made him a vizard, and why is it a bad thing to be a vizard, much less what makes them hate soul society for obtaining that stage? Vizard is the subduement of the inner hollow as bankai is the subduement of the zanpakto^'s avatar.
It could be that informal/inproper training leads to being a Vizard, in that case I wouldn't be suprised if zaraki had a hollow mask as well.
Sorry went on a tangent again lol....
On-topic- Zaraki was awesome in this chapter, I was getting tired of that Nnoitra bastard, it does seem odd that the captains and subordinates can beat the espada so easily and Aizen not be so concerned. I'm going to side with Baj on the 'holding back' theory, since we saw a 'new' move by Byakuya that he didn't use on Ichigo because he thought little of him, like when he nearly killed Renji.
Byakuya never likes to fight full-throttle and uses what's neccesary, while Kenpachi is the opposite.
We still need to see the other captains fight, it's a little annoying seeing the same ones fight again=/