Damn, it's always the fundies, isn't it?
I think it's interesting that the Quincy use a lot of religious language and rhetoric to get their point across, which fits in with the general concept of the "holy war" they're waging against the shinigami. And it fits - if the hollow are the unclean/sinners/outcasts then the Quincies want to eradicate them entirely, and SS would be the blasphemers who allow them to live. It becomes more apparent in this chapter too that Ishida is not involved with, or has been deliberately kept from, the true nature of a lot of what's going on with the Quincy. SS Fabulous references Souken in particular this chapter as someone who refused to fall into line in regards to the "progress" of the Quincies, which makes me think that, yes, Ryuuken's abandonment of the Quincy had a lot to do with this.
This also makes me think of Mayuri and his experimentation on Souken way back when; could it be that Mayuri actually isn't as monstrous as he seemed back then? If Soul Society knew the Quincy were going to be a problem, isn't it possible they just captured Souken and assumed he was a part of the whole crew? Either way, it's going to be bitter for Ishida that he's spent his life claiming his Quincy heritage and scorning the shinigami when, in reality, his own heritage is a lot more horrifying than he realized.
And then: Allon! Who the hell saw that coming? And this is what I love about the ambiguity of Kubo's writing. The very figures who seem like the obvious baddies - Allon, Grimmjow, Ulquiorra, and maybe even Aizen when it's all said and done - are sometimes the ones who end up becoming allies. Awesome. So Ichigo's going to have some help - and Urahara's still around, so I'm not too concerned.
Dying to see where this is going to go. Surely, surely Ichigo will become the ultimate target, being perhaps the greatest "sin" of all: a hollow/human/shinigami hybrid. And surely, surely Shirosaki is going to have something to say about that.