Board Thread:Questions and Answers/@comment-10922879-20130617143901/@comment-11051098-20160603230643

That too. I guess it's better to say that Ichigo is now probably at Vasto Lorde-level in power, and thus capable of using a Cero of equal power to Gran Rey Cero when utilizing his Hollow side.

Either way, the words "Gran Rey Cero..." at the side of the page where he charged it up, appeared to be a description of sorts, it might not be a "Gran Rey Cero" at all, just a Cero of equal power. Heck, it could be as powerful as Cero Oscuras for all we know.