BM & AR?

Is there something going on between Mitchell and Robinson? In the WSU game the announcers commented over and over about Mitchell not throwing to a wide-open AR.
At the TCU game (as I shivered wet and cold) I noticed AR get ignored wide open or in poor single coverage over and over again. On at least one occasion AR walked off the field visibly angry at being ignored. Anyone have any insight? Just more BM incompetence or is there more to the story?
At the TCU game (as I shivered wet and cold) I noticed AR get ignored wide open or in poor single coverage over and over again. On at least one occasion AR walked off the field visibly angry at being ignored. Anyone have any insight? Just more BM incompetence or is there more to the story?