Can you confidently say that Dowdle, Deuce, and the other spare parts are better RBs than Zeke?
I can't.
Dowdle is in his prime and was still pretty ordinary. Plus there's a long history of backup RBs who performed worse once they were elevated to the RB1 position and became the focus of defensive game plans. The two immediate examples that come to my mind are Tony Pollard and Troy Hambrick. Both looked much better in backup roles but as soon as the lead RB load was heaped on their shoulders both of them performed much worse than they did in previous seasons.
Don't confuse this as me celebrating the return of Zeke. I'm just highlighting the overall lack of talent Dallas has at RB.
