User blog comment:Xilinoc/Everything but the Rain op. 9 - "June Truth"/@comment-5551986-20130508134235/@comment-1332195-20130509182234

I'd say Aizen's Travelling Circus are the most likely candidates; Aizen stated back in Deicide that he had a hand in developing Ichigo's powers, and while that is adequately explained by the bite from White and what we've just witnessed, I can't help but feel that as a result he'd have more interest in Ichi's development than Yhwach would.

But I could be wrong. Again.

I'm pretty sure the mini-arc will continue after this chapter (maybe 3 more weeks), but the writing has definitely improved over what TK has been churning out for the last couple of years imo.