Bowden is a receiver, not a running back. Koback is the running back in this class. Koback was just cleared to increase his physical activity and will not have any restrictions by mid-June. He will be ready.
Just out of curiosity where did you get that he will be a receiver here? He was a QB in high school and most all of his highlights are running the ball out of an option type offense - 2,277 yards rushing, 1370 passing. In fact I don't see where he played receiver at all. I would be surprised if the staff has already decided to use him as a receiver since (1) we don't know what kind of depth we will have yet at running back with Koback status still up in the air (2) he didn't play receiver in high school and (3) he's not here yet.