User blog comment:Xilinoc/Zanpakutō & Tōjū arcs - Review/@comment-493809-20140122162609/@comment-4484409-20140124182445

I wouldn't say the transformation was out of nowhere. He consumed the hollows and after being rejected by Koga, he lost control of them and they took him over. We've seen in the current arc that Zanpakutos can be hollowfied and we know that Ichigo's Zanpakuto spirit is a hollow as well so this doesn't seem far fetched to me.