Its not "helping" but its not hurting the argument either. Chiefs goofed on spending a 1st rounder on CEH and the world kept moving. The NFL kept moving. Using ONE FIRST ROUNDER on a RB is not going to kill your franchise. Its also worth noting that Bijan and CEH aren't the same caliber. As a matter of fact....if CEH was in this draft....I'd probably take 4 guys over him before I look at him.
Problem is the Cowboys can't make first round picks that don't "hurt". They are pretty clear they expect (and that's obvious given their inaction in adding quality FAs typically) that their first round picks have to be immediate impact guys. So I can't say, it's OK to take a TB in the first round because he won't "hurt" us.
It's easy to overcome a dumb first round pick when you have Mahomes to cover up shortcomings. We don't have that luxury. So we can't use the Chiefs as a blueprint and say, hey, its OK if we take a TB and he doesn't help.
We did the use a first round pick on a TB thing. It didn't work out overall for team success. He didn't change the direction of the franchise. No need to repeat that mistake. Use your prime picks to fill the more valuable positions, backfill the TB.