In many of the discussions here I read about the negative run plays and how frustrating that is and where the blame needs to go.
It is important to understand that this system is a little different than a straight up and more conventional blocking scheme where the RB knows which gap he is headed to before the snap.
In that scenario the RB goes full blast from the snap to the hole. Hopefully the Linemen have created a crease or gap between the DLinemen and there's room to run.
In the case of the ZBS the RB is asked to read and react to a crease and often requires a cutback to the crease caused by cutting the DL on the backside of the play.
This system WILL result in more negative plays than other systems because of the slight delay of the RB in the backfield BUT will also reward a team with more upside for bigger gains when the RB does find that crease.
Now I believe as the season goes on and DL are slowed by injury or tired legs and the footing gets tougher with colder weather there is a definate advantage with this system. In otherwords I believe it's more than coincidence Grant had a big second half last year.
Yes, it's frustrating to see Grant get caught from behind before he gets started but there will be times the defense calls for the DL to crash down and it's very difficult then to put your body in front of them and get those backside guys on the ground.
It is a risk to delay the back from getting up a head of steam off his first step and probably will result in more negative plays than we like to see but the reward for using the speed of these defensive players against them can definately pay off.
I guess what I am trying to say is its not always that this "O" lineman can't block or Grant can't run. There's a lot more than that going on out there.
"The train is leaving the station."