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Along the lines of Moe's comment.
Montgomery also has seemed comfortable attacking with the fastball, out of the 'pen for 1-2 innings, and his offspeed stuff has really played up as a result.
It's not like Nate Karns is Aaron Sele, trying to make a mediocre fastball work. He could deploy the same strafing-runs idea. Might well turn a light bulb on for him, help him jell.
....
M's website shows Miley back in there Wed, but TBA on Thursday. Which would be LeBlanc's or Taijuan's spot, with Karns' the day after that. So they're well positioned to make their choices.