Notre Dame has not yet begun thinking about Michigan, and will not for another week, per Irish head coach Brian Kelly on Saturday. Before that preparation begins, Notre Dame will focus on contact in preseason practice this week.
Kelly specifically cited wanting to see the converted running back duo of sophomores Jafar Armstrong and Avery Davis in tackling situations. Given how much they will presumably be needed in 19 days against the Wolverines, that pseudo-live action would make all the sense in the world.
Armstrong and Davis get lumped together all too easily. Exhibit A: The previous paragraph.