They went with 1 RB because they didn't want to deal with OJ being selected to the team. IMO, that cheapens the whole ordeal. OJ, the football player, was probably the greatest Bill ever. He was a guy that redefined what an NFL Running Back should be.
Now, OJ the felon is another matter entirely. For what it's worth I think these sort of things should just look at playing careers and not off-the-field behavior.