Like I said earlier, for the little bit of improvement the Oline has made in pass protection, they have REGRESSED majorly in the area of run blocking which is what has killed Henry.
Before yesterday, Henry and McGahee were averaging similiar yard per carry averages (Henry 3.4 and Willis 3.7). If Henry had played yesterday and got to touch the ball 26 times against the Dolphins tiring Defense, he would have been just as successful as Willis was, and might have even got in the endzone.