McCoy was a second round pick as well. It doesn't prove anything. Tom Brady was drafted in the 6th round, so was Antonio Brown.
The point was supposed to be that the RB position is devalued, meaning just plug and play. And yet our offense really didn't start hitting it's full potential until Bell emerged. Too many people are under valuing the RB position, and what a stud RB means to teams. "oh we can find a stud RB in the second round", if it were that easy, there would be more "stud" RB's in the league.
By saying the RB position is devalued, you are saying when Bell's contract is up, we just draft his replacement and let him walk. You are saying that his two game suspension won't be that big of a deal because we can just draft someone that will equal his output for two games.
See New England.