from wikipedia
Though he was only with the Bills for three years (1962-1964), he remains the team's fifth leading rusher all-time, and led the league in scoring in each of his three years as a Bill. Gilchrist was legendary as a pass defense blocker. Cookies' teamwork and willingness to "step up" and block for quarterbacks was a key part of his Bills contributions, and made the Bills offense of the era a unique challenge to defend. Gilchrist ran for 122 yards in the Bills' 1964 American Football League championship defeat of the San Diego Chargers, 20-7. His 4.5 yd/rush average is second as a Bill only to O.J. Simpson.
He is on second team ALL TIME AFL as full back as well, was league MVP...you gotta go with the Cookie.