Re: Rookie wall
The rookie wall thing is real, but it's not a cinch. By all accounts, Watt is a very hard worker, which is something lots of rookies aren't. How many times have we heard Kubiak say about some guy, "he needs to learn to be a pro"? Hasn't said that about Watt, to my knowledge. Also, staying in school the extra year tends to help, IMO. It also helps when the college player is going to bowl games, because that lengthens the season and acclimates the player to that workload.
Anyway, I think it's a combination of factors, and it's pretty evident that Watt is someone really special.
A real MVP contributes in all phases of the game.