Frank Gore was the best running back the San Francisco 49ers have ever had.
Yes, the 49ers have had the likes of Tom Rathman (current 49ers running backs coach, too), Joe Perry, Roger Craig, Garrison Hearst, and Hugh McElhenny, but none of these all-stars have lived up to the incredible career that Frank Gore, now an Indianapolis Colt, had for the 49ers in his decade as a member of the squad.
This is a big claim to make, though, so allow me to back it up.