User blog comment:Xilinoc/Ch. 644 - BABY, HOLD YOUR HAND 7 (Never Ending My Dream)/@comment-5303512-20150924113750/@comment-5398287-20150924132129

What you're forgetting is that Hitsugaya, and likely Rangiku, were specifically stated to be alive prior to Giselle zombifying. Meanwhile, Rose and Kensei were straight-up dead due to Gremmy, so I don't think he can do quite the same thing to them.