the bills passing attack is so good (elite) many don't see how below average the run game is.
having said that, paying big bux to a FA RB is not the answer.
look for major upheaval/upgrades to the OL next year as the most likely path to a better run game.
bills have so many other needs .....EDGE #!, OL, TE#1, CB#2
will likely add one new RB via FA (mid level) or draft (mid round). i dont see them using a high draft pick or cap dollars on a FA RB in 2021