User blog comment:KillRoy231/Mary and Lucifer to return/@comment-10889355-20170620051110/@comment-1975828-20170620124846

It could happen on the show, but I wouldn't want it to. * shrugs *

And there is no reason Michael can't go insane. It's almost like saying Lucifer can't get angry. And even if Lucifer was lying, God confirmed Lucifer's statement.