User blog comment:Rafe Adler/"Mint Condition" Discussion/@comment-31057575-20181103155615/@comment-74.132.82.188-20181104124221

Honestly, I think you are over-thinking. Although this is a very good question, those aren´t the kinds of details the writers pay much attention to. Case in  point--the presence of hunters in the beginning of ep. 3 that all seem to disappear when Jack and Cas save the victim of the witch. Or that they seem barely concerned about Nick now when they kept him isolated in the bunker before & Cas is concerned about the effects of Lucifer. It is possible that Michael went to Duluth, created the uber-werewolves, and left. But your question is another one that viewers will try to rationalize but the show will never answer.