User blog comment:Xilinoc/Ch. 675 - Blood for My Bone/@comment-24769684-20160526105302/@comment-5398287-20160526112430

"But at the same time, you need to foreshadow this shit better! Other than the cover page, this came directly out of nowhere as none of us thought Ichigo would rely on these powers because he swore to put those parts of him away!"

I, uh... you may be remembering the wrong part of the series, friendo. The last time Ichigo addressed his Hollow powers, he was deciding to accept both the real Zangetsu (Hollow powers + Shinigami powers) and OMZ (Quincy powers) as his power instead of continuing to debate over which one was the right one. In theory, this is a natural progression of that, as well as a callback to when he had his Quincy abilities awakened by interacting with Quincy Reiatsu; he's accepting his dark side and has thus gained some form of control over it, rather than spazzing out when it tried to take over like he did during the Arrancar arc.