I think Cain is wrong for Mir but in Mir we are talking about a UFC champ with wins over Sylvia, Brock, Nog and CC. He'll always be remembered as a fighter of average talent but a sharp mind and the willingness to evolve.
Mir needs at least three victories to get a shot. I doubt he will ever get another shot. I hope he doesn't. I believe he can beat the elite. Kane is Undertaker's bro BTW.
Cain's standup defence is a bit questionable I spose but to be he seems like a terrible matchup for Mir given his weakness to GnP.