We run the I back formation because it is probably best for Ricky...this gives him the ability to get the ball, and run to one side, and then cut back based on how the blocking formation is...The split back would be better for a scat type back that can jitterbug in the back field...most of our runs are between the guard and tackle on either side and that allows Ricky to bounce it outside or cut back between the center and guard...