I think Fish let it slip there.
Bottom line is that taking a QB is projecting what a guy will be capable of in the NFL. Fish is certain Wentz will be in Super Bowls. That means he sees him like Mayock, that he's going to work his butt off to continue what he's done thus far in his life from his straight As since kindergarten to winning the championship in his first year as starter.
Wentz has swag to him man. He has that QB magnetism many guys are missing. That alone isn't such a big deal, but when it's on top of his size, arm talent, athleticism, and history of working his butt off to be the best? Well, that sounds like a slam dunk to me. The kind of prospect that would lead a team to move up from 15 even if it means giving up a boatload of picks.
Nothing against Goff here, either. I love him. If I was making the pick he'd be my guy because I want a GSoT type offense. BUT, that said, I understand why the Rams will take Wentz. The dude is a safe pick with a high ceiling, and for a QB that's a very, very rare thing.