I agree with a lot of this but I just think there's more blame to go around than just DS. We have not blocked well in the run game and Singletary isn't the type of back to create when there's nothing in the hole of the play call. The lineman, Daboll and o line coach are responsible for that too.
Kromer is a welcome addition along with some changes on the line.
For me it's a bad RB class and a bad spot for the Bills to be in. We'll try to have an adequate running game again, I suppose.