Well I don't feel Williams is a slam dunk to be a great QB TBH. He does have elite elusiveness in the backfield and a great arm but playing in the PAC 12 doesn't do much to prepare a QB for the NFL. As @Dr. Strangelove has mentioned the Pac 12 defenses are as soft as butter allowing for QBs to put up great stats without developing going through progressions or reading defenses even. Basically Williams only had to look at his first read then scrabble ( if his first target wasn't open) and find a receiver that found open space. He'll have to develop those skills ( going through progressions with receivers and reading defenses) in the NFL. However he has that elite god given elusiveness to help him and he'll be on a rookie contract which really helps when it comes to stocking a roster.I strongly disagree that it would be a step back. I’m certain Williams will be a better NFL QB than Fields, Fields is pretty much a bust and a glorified running back, he doesn’t have what it takes to be an NFL franchise QB.