Finally got around to reading the chapter. sorry for the late post.

hmm - ever since the last chapter its been bugging me when the dude sucks the drink up , but when they say that they are "like" hollow, does that include consuming souls? (human even?) It seems to me that maybe thats why they want to get rid of their powers.
My guess is that the one that attacked Ishida is one of them who has embraced his cannibalistic tendencies.