User blog comment:Touchinos/"Ouroboros" Discussion/@comment-25027688-20190308213100/@comment-10889355-20190308220908

We don’t know if Lucifer still has Jack’s grace. That’s speculation as of now. Hell, we don’t even know if that was Lucifer in The Empty.

Jack only needed an Archangel grace to be powered again. That was said in the earlier episodes.