User blog comment:Xilinoc/Ch. 553 - Frozen Cross/@comment-1747976-20131020025317/@comment-11051098-20131022165407

When the mustache-guy used his Vollständig against Shunsui, he didn't appear to become weaker after he left that form. It looked like he simply reverted from a more powerful form back to his normal form.

Quilge is the best example we have so far to study a Vollständig-form, but he was killed while still in that form.