User blog comment:Xilinoc/Ch. 584 - THE HEADLESS STAR 3/@comment-5551986-20140611182431/@comment-5398287-20140611221304

Last time we saw Hitsugaya, he was on the brink of death with no medical personnel around. I don't blame him for doing nothing.

And as for Yhwach's motives, he just wants to stay alive, and war is the best way to ensure that he does so. Mind you, I do want a flashback to his first battle with Yamamoto, though.