Yeah this is kind of what sparked my question. Putting an elite talent at RB seems like a better way to surround your young QB with talent than drafting a CB or LB.
Well, the counter argument to that is that an effective run game doesn't necessarily require an elite running back, and that a defense that returns the ball to the QB with shorter fields and doesn't force him to chase multi-score deficits actually relieves a huge amount of pressure.
I don't have a particularly strong opinion either way, a couple of my favourite players ever were running backs so I'll never complain about having a special talent there. I just don't know if it's especially valuable overall to the team we think we're going to be.