But let's say, for discussion sake, that he is, Jim. Several points apply:
1. None of the winners of ****'s Kitchen have ever been given the advertised job of executive chef. So whether or not Dave is ready for that is academic. Can he grow in to such a position? Depondent sayeth not.
2. And most important. Half looped, and with only one good hand, he managed to outcook the rest of them. So he must have something going for him.
Would I turn a kitchen over to him? No way. But that applies to virtually every contestent ever on that show. I've not seen one of them, in what? five seasons? who had the chops for that.
Some fair cooks, no question. But running a kitchen is not about cooking skills. It's about management.
Let's look at Kevin, for instance. Kevin spent the series doing two things; back stabbing, and laying back. His strategy was to never take a risk, never be on the chopping block. That's what got him to the #2 position. It wasn't that he was so good, it was that all the others were either useless, or made serious mistakes when it counted. In fact, the few times he had to appear in the forefront, he was found wanting.
So then, for the finale, he was going to whip it all out, and really strut his stuff. And he failed in the attempt, because he was a legend in his own mind, but not in anyone elses.