I read an interesting article written by James Koh with some numbers crunched about O-Lines run blocking. He was looking at the specific metric of yards gained by an O-line before a defender got within 1 yard of the RB.
According to him the worst 5 run blocking units are:
Cowboys - (-0.41 yards gained before a defender closed in on the RB) (Also shocking I know)
The NFL average is (+0.30)
With all that said, I think that if these interesting metrics are true, I would not be buying into Mcfadden OR Morris. It could be testament to just how good Zeke actually is, and how much the O-line has potentially changed from last year in the Run block category.
Out of interest the 5 best were;
Redskins (+0.90) Somebody asking about Perine???!!
Buccs (+0.85) Oh wait that somebody is also asking about Douggy M!!!
edit: Link to the interesting article I read.