Agree it's early on the rookies but very promising. If they continue to build on this and improve next year, look out. There have been a lot of one-year wonders, or players who are just on hot streaks and peak early for GB. If they prove it's repeatable over 2+ seasons then I'm on board.
They are getting a lot of important contributions from young players, and there's plenty of blame/credit to go around for that. Certainly Gute deserves some.

As for Walker, he's everything physically you want in a T, and he's been better since they did the sharing with Njiman thing, but I think his run blocking is still iffy and his footwork/fundamentals are bad. If he can really work on that this offseason he'll be a good one.
Just getting starts and league average play from a R7 pick is gold in this league. Average starting LTs are generally not cheap.