User blog comment:Xilinoc/Ch. 584 - THE HEADLESS STAR 3/@comment-5551986-20140611182431/@comment-5693502-20140613143829

The Hollow-Soul thingy was discussed briefly as part of another question here. The threads's been closed though (why ? I don't know...) so you won't be able to put across your own points.

I like that. Urahara always seems to be in the know and, considering he seems to know a bit about the Soul King (from his brief chat with Aizen), it wouldn't seem unlikely that he might have done something of the sort.