Have no clue how anyone offers an opinion on this question as-if it has any legitimate insight whatsoever.
He's not been a coach. So there's that.
And.
Even if he had, like for any other assistant, we would be going strictly based on what others... who do have insight from actually seeing what he did in practice... thought about his work.
The more interesting question to me is, would you be comfortable if he was invited to play and coach?...
As far as I know, the last guy to do that in a Cowboys uni was another TE... Dan Reeves.