User blog comment:ArtDraw12/TD Theories: Who May Return in Potential Future Seasons?/@comment-28008011-20160816121044/@comment-11883116-20160816131106

Becuase it's mentioned on that page that "Word of God" confirmed Mike won't return due to his controversy. However, from all I remember these were only speculations, not something officially confirmed by the crew. For Trent that page also fits due to him actually being "put on bus". Also, it worked for the joke.