Josh will hit the TEs if they get down the field. RBs on the other hand, we have been fixated with, but Josh is not the check down to the back guy. He may toss a screen pass (if only we could properly block one)or if the RB can get lose and find a soft spot in the zone perhaps, but he is 99% trying to push it 10 yards down the field.
We can get players or try to design an offense a certain, but if the QB doesn't want it, he is not going to take those throws...