User blog comment:Xilinoc/Ch. 637 - BABY, HOLD YOUR HAND/@comment-6812492-20150730185509

Idle speculation: the thing that was extracted from Rangiku which became a part of Aizen's Hogyoku = another of the Soul King's limbs? Kubo did say her past would be a part of this arc--I've been curious about how. This is one way it could fit in.

I'm also glad that Pernida did not turn out to be a kidnapped/brainwashed Yachiru, though that still leaves the question of what happened to her...