I wasn't a fan of the idea before the season started, but based on the limited sample size I'd have to say I have seen enough of McFadden and the others to know that McFadden should be getting the majority of the designed runs.. Randle and Dunbar are both better on the short pass, and Dunbar is starting to show he can run some farther routes too.
We need to draft a top RB in the second round next year for sure.
I agree, Randle doesn't go down easily despite his size. He's got surprising strength, but I'd still rather see what McFadden can do w/ more focus. Randle doesn't hit the hole fast enough from what I've seen and I think he'd be better as a passing threat and change of pace back.