Barber's aggressive style is aesthetically pleasing. But at 6-0, 221 pounds, there's a question as to how he would hold up over the course of the season as a lead back.

This is an odd statement. I would call 6'0"/221 about normal for today's primary RBs. It's larger than many of the historically uber productive backs like LT/Holmes/E.Smith/Payton/Sanders/CMart. [And no, I'm not comparing MBIII to those guys]. If anything, I'm wary of larger RBs as they seem to be the ones taking an abundance of hits and getting dinged routinely. Furthermore, I'm far more interested in a guy's running style when deciding if he's likely to take direct hits. Maybe the point of the above is "aggressive style" is synonymous with "taking a lot of hits," but I've not noticed Barber getting nailed with his running style.