I really can't wait to see Captain Furfag fight again, against someone who isn't invincible this time, like both times we've seen him fight.
As for who is killing them, maybe its little kid Shuhei? I mean, he's one that we've never seen so much as anything but sword-swinging, maybe he's trying to avoid using his shikai because its, as Urahara has described his own, "not nice."
I mean, why else would he be there? Coincidence? Yeah, that's something that Kubo's ever going to use.