I'm sure Denny makes a great mouth call, and this particular one may be a great one. Only the guy that runs it will know for sure. That is the problem with mouth calls, you can "test" them before they go to the buyer. Whether that particular call is capable of producing great turkey sounds would be very hard to say. Everybody that makes mouth calls makes duds on occasion. The call-making process is to imprecise to be able to avoid that.
Having said all of that, either the proph slipped a bit after it was crimped, or Denny did not get the reeds up tight on one side of the call when he crimped it. You can see by looking at the call that the reeds are at an angle to the front of the call. That sometimes would make no difference in the sound the call can produce, but it might, especially in the hands of someone that is not as proficient at running a mouth call as Denny Gulvas or others of his caliber, and especially with someone who might not know how to go about modifying a mouth call to find the "turkey" in it.
As a call maker myself that sells a few calls each year, if I sold a call that looked like that and the buyer contacted me indicating that he could not get good sound out of it, I would replace it without question. Of course, I would also not be surprised if someone told me the call looked ugly,...but sounded great.