He just runs too out of control for me, his body is not compact enough, he's not low enough...those arms are too far out there (with the ball)...it's easy pickings for those defenders. He doesn't fumble every game, but he looks like he could/should.
He's not a special runner, and if you're going to fumble like that there is no place for you. I honestly would give Bolden a very very serious chance to win the starting job. I like Vareen, but the guy gets hurt and he can't break tackles - we really don't know what he is just yet - but I've seen him get brought down too easily by one defender to think he should be a feature back. I will say Vareen has some serious pass catching skills - he shook a corner out wide that should of been a long gain if Brady had gotten him that ball. He catches almost like a slot receiver...very smooth catchihng the ball...natural receiving skills. Blount is too slow and not powerful enough for my taste.