Great point. And it would have been the same had they drafted Manziel. They would still be spewing forth nonsense. Same with every team. That is just how this stuff works.
Jerry himself alluded to this right before the draft. He essentially said they weren't going to pick Manziel and if the opportunity does present itself, and to Jerry he was a great player, they were going to look at the possibility I getting value out the pick.
The reality was probably Dallas looking to trade down, but nobody wanted to. It's clear Manziel wasn't as highly valued as the 'analysts' were saying right after pro day. Prior to that workout, he wasn't even the second or third rated QB.
One Pro Day, with a scripted plan, isn't going to change minds so dramatically as far as a QB is concerned IMO.
The NFL draft was moved to a new time as far as I know. They are making even more changes next year. Ratings were higher than both the NBA and NHL playoffs. The hype created around Johnny Football is partly responsible.