User blog comment:Xilinoc/Ch. 586 - The Headless Star 5/@comment-11506376-20140625171259/@comment-5398287-20140626061807

Maybe, maybe not. He left for Hueco Mundo without saying goodbye to Ryuken, and he might've done the same thing this time, since Ryuken might have attempted to stop him. I think Yhwach was referring to Uryu saying goodbye, in a sense, to Ichigo and co.