Well, I do agree that it looks like SF is the more improved team, and will be better than the Bills, but it's the scheme that will give Willis some trouble in becoming a FF stud. First, he has to learn the system, something that Vilma is still struggling with, and he has a rep as a smart player. I think the system puts a ceiling on Willis, but there are those rare exceptions that can become studs in their own right in a 3-4.
Poz's value will also be down a bit becasue he will most likely be a 2 down MLB, with Ellison and Crowell in the nickel package. Still, I expect teams to run on the Bills this year and test that almost new LB corp.
Willis was my 3rd ranked LB, behind Poz and Beason, and purely due to the system each will play in. Willis is clearly the most talented of this group, but that doesn't mean he'll be the better FF performer.