I mean, look. Zeke is obviously very good.
Here's the thing. Murray was a generic mid-round pick who became great as we built a great o-line.
Then Murray left and we replaced him with a guy off the streets who no one really wanted. He was coming off 3 straight years of averaging in the *low* 3's (not even the high 3's, the low 3's... 3.3, 3.3, 3.4 yards per carry in his previous 3 seasons). And in our system with our o-line, he was the 4th leading rusher in the NFL in 2015. Despite Romo missing most of the year and Dez missing time too. So defenses had no one but the RB to worry about and he still finished 4th in the league in rushing.
When your o-line and running game are that user-proof, do you have to spend a 4th overall pick on a RB (bearing in mind what era of football we're in) and then give that RB a massive extension? No.
Zeke would have to do borderline impossible things to justify this use of resources. Good as he is, he's unlikely to ever justify those resources. Not when we know a generic mid-rounder or bum off the street could walk in and give us production.
Oh well.