User blog comment:Xilinoc/Ch. 636 - Sensitive Monster/@comment-10497166-20150723101510/@comment-25121259-20150723212010

Mayuri already "completed" his research of Quincy and lost interest in them, it was only rekindled in SS arc by Uryu. He tends to dispose of things that no longer interests him, so most likely, aside from a few samples, he likely ordered his men to deal with the corpses.

The torturer meeting his victims in battle years later, is a pretty standard karmic play. Although it would be interesting if Mayuri met with Uryu, since this time their positions are reversed.