Board Thread:Questions and Answers/@comment-9826910-20130618064245/@comment-11051098-20130705220616

Makes sense. The merged spirits of both his powers made him as strong as he was meant to be, with his powers united. I didn't think about it that way before, but it makes sense.

So Dangai-Ichigo was his true power level, and now that he's at "peace" with his powers, and has a real Zanpakutô, that is what power level we can probably expect him to be at again.