I understand the kid looks good and has an amazing opportunity, but in my opinion he's being overvalued pretty badly right now- in the top 10 on almost everybody's list (in redraft) and Bloom has him #3 overall. Thats nuts, imo, for someone who hasnt taken a snap in a real NFL game. And can we further consider that Dallas was 21st in RB fantasy points last year (two years ago they were 1st by a long way). So you're gambling... with a first round pick mind you, that this kid can come out of the gates as a top performing back, and that the Cowboys running game returns to dominance.
Elliot looks like a great prospect, but he isn't Adrian Peterson either. If he were starting for another team, we wouldnt be having this conversation. Rookies are so tough- the pressure could get to him, the assignments might confuse him, he could be a fumbler in the NFL. After a season or two you pretty much know those things about a player, but with a rookie, i dont care how great he looks in preseason or college, history shows until they get under the lights you just dont know.
Of course he could live up to expectation and vie for a top RB1 finish this season, but gambling with an untested rookie with a first round pick is dangerous. As the saying goes, you cant win your league with your first round pick, but you can lose it.