User blog comment:Silver-Haired Seireitou/Sake Time with Sei - Sternritter and their Powers/@comment-4509522-20140327173616

I've always thought that Driscoll's "The Overkill" ability allowed him to basically absorb power from the beings that he killed and make it his own, something that is generally considered impossible in Bleach. That's just how I've seen it.