I respect your point of view and I acknowledge that none of us really know about the grades we have on players at this point, as it is proprietary, top secret stuff. You may well be right.
But I will say this .......I do not think that Mixon is the 4th best back in this draft. I think Mixon is in the mix as being the best overall back in this draft. If I recall he was a 5 star recruit coming out of high school and is arguably a more complete back than any back in the draft. Without the baggage, then he could really be in the mix in the top 10.
I am not saying that he is the next Zeke. I am saying that if he is the best back in the class and we have a top 10 grade on him, I don't care if you have Zeke on the roster or not, you pull the trigger on him (assuming that his character doesn't scare you off).
This time last year I heard tons of posters say no way we would take Zeke that high. Polian said it was a no brainer that the Cowboys would take Zeke if he was there at #4. He was spot on. He acted as if it was a foregone conclusion before it ever happened. That was late (probably the last 10 days before the draft).
Mixon is getting traction as a serious threat to go in the first round. The word on the street is that he is probably the best back in this draft. I think the buzz is starting to catch up with his actual grade. If he is not "in the box" and the grade is there, then I think he is in play. I grant you that wouldn't be ideal comparing to needs, but it is possible. Keep in mind the close relationship between Stoops and Jerry.