The long runs need to be minimal and J.J. and Joyner as well as any run defence by corners are going to be important also to a decent third down defence and defencive yardage totals.
Even if the Rams are ahead the opposition will have a chance if they get to second level in the running game.
Doesn't have to be power running either.
I don't think we have a great answer to a simple short pass to RB or a TE 7-10 yards from scrimmage.
A back like Kamara or TE like Graham and the other team will be in striking distance to come back from a deficit.