I just heard an analyst say that Belichick schemed to take the run away and make Tannehill beat them, and got beat by the run anyway. Looking back at this game, I think Belichick schemed to stop Tannehill from beating them, and took his chances getting gouged by the backup runners.
For the life of me I can't figure out why.
A running game is always a large % OL talent and attitude. Losing the bell cow RB doesn't necessarily change that attitude of the OL. If the QB is having a great game it can open up the running game, but for a bend-but-don't-break defense that doesn't hurt you all that much. But if you let the run gouge you, and that opens up the passing game? That can really kill you. More importantly, if the OL gets the attitude rolling and wins the psychological battle, that can be real trouble. That's where the Titans embrace the "next man up" attitude and start believing. That's when you lose games you should win.