User blog comment:Rafe Adler/"The Big Empty" Discussion/@comment-31.6.173.146-20171105110031/@comment-10889355-20171105122016

Nope. Jack will only be stronger than Lucifer. We have no explanation for how he managed to wake Castiel (though I assume it's their connection? Does Cas still have a bit of Jack's grace in him? I don't know). Hopefully they explain it on episode 6.