I think it depends on the health of 2AM.
If he is out for the year, I would see them holding off playing LM. Reasoning is that they need NV to get as many snaps as possible for experience, and they would hope NV makes it through at least three games without getting hurt. If he would get hurt in the last three games, LM can finish the year without losing his redshirt.
If 2AM appears just a little dinged and will be fine after sitting 3 weeks (off week next week) then they have more flexibility.