Im always for improving the oline but I think Williams would have made last years group look a lot better than they looked. Yes he should be an upgrade or why do it I think that is obvious.
Did you watch any O'Sullivan films? Fields was not the problem with the oline. The oline coach we still have on staff had to be the problem or else Getsy was doing some odd micromanaging of the oline for an OC to bother with.
It was pretty basic stuff that I can't comprehend how you can teach adults who've played the positions for years to do wrong.
The reason I'm OK with Williams is he's mobile enough to not die with the same oline problems. If he does anything better with the same problem existing it will be looking to throw longer. Where Fields' 3 years with this crap have taught him just run when the oline decides to not block because the WRs aren't going to come back for it when the QB starts scrambling.