I have no idea if Robinson is the slowest RB in the Big 10. It doesn't really matter to me. On what basis are you saying he is "one of the best"? He's 6th in the league in rushing. At this point of the season it's impossible to say who the "best" is, given the huge games that some backs have put up against inferior opponents. Take a look 4 games into the conference schedule, look at conference games only, and then you'll have a more clear picture of who the best back is.
To your second point, I have never heard he was a throw-in to get Bernstine. Iowa doesn't usually operate that way. Way to relagate Bernstine to an afterthought. As a true freshman, he played in all the games and on special teams (as are some of the true freshman this year). Then his sophomore season he was the nickel back, on the field a lot, playing behind Fletcher (now in the NFL) and Spievey (in the NFL). Then just as he was ready to start in 2009, he breaks his leg in camp and has to sit out the whole year. Now he's back, but my guess is he's not yet back to what he was prior to the injury. He plays on many of our special teams and will likely make a very good safety next year in Greenwood's spot and is very good depth this year. I dislike it when fans dismiss players as failures when outcomes aren't what we think they should be.
Does Robinson become "indispensable" if Jewel Hampton never gets hurt in 2009 camp and then again this year? Or of Wegher doesn't go through goodness knows what and basically leave the team this year? Maybe he would have emerged anyway, but sometimes there is some fortune involved in whether or not a player gets the chance to shine. Kudos to Robinson for being ready when called upon. He doesn't fumble, always lines up in the right spot, has good patience/vision for this system. He doesn't have elite speed, but he is what he is, and I'm happy to cheer for him.