Ricky Williams is a different cat, period. To him football is something small, and at this point in his life, fairly meaningless. He's rather go out, travel the world, smoke some good bud, and ponder philosphical questions. Screw football, fame, and fortune. Instead he's going to walk the Earth, see new places and get into adventures like that dude from "Kung Fu". Ricky recently sold two of his cars (a Lamborghini and some other expensive car) and donated the money to a local school. Its not fair to compare him to Jim Brown, Robert Smith, or even Barry Sanders. Jim Brown dominated the NFL and felt there was nothing left for him to do in the league. I don't think Smith was really interested in football to begin with (he has a new book coming out soon, I want to check it out to see what's going on in this guy's head). Sanders just got tired of playing football. Ricky.....well Ricky is just Ricky. One strange cat.
I don't think he's a pussy for leaving the game. Obviously its not his thing anymore and he wants to move on. He has other things he wants to do with his life. Playing ball isn't everything. Can't hate a guy for doing that. The fact that he up and leaves when his team is getting ready for training camp, after having attended off-season meetings and mini-camps, that's just plain selfish and screwing over your team and teamates.