Board Thread:General Discussion/@comment-26815763-20141002235646/@comment-1387259-20141003200740

The Yhwach giveth, and The Yhwach taketh away.

Remember that Yhwach does have this power (see Schrift). Chances are, after Shaz got Ichigo'd, his power went back to Yhwach. This doesn't mean that his power was given to someone else, it was more than likely just his letter, with a different epithet and a different power based on the new recipient of the letter. Granted this is all just a guess on my part.