To an extent. Tom Brady does not make the playoffs as Redskins QB. Agreed? Probably doesn't survive the first 4 games. Agreed? Peyton doesn't stay upright for long as our QB.
Rogers, Brady, Peyton, there best seasons have ALL been with very good O lines. To prove this out, Romo didn't get better. Dez didn't get better. Whitten and what's his face, the RB, didn't get better. The O line got much better and the D got better by cutting some stars and adding some young depth.
I don't know if that's necessarily the case. Like I said, the Colts had minimal personnel changes from when Peyton played to the year he got hurt to the following year. Yet they went from 10-6 to 2-14 to 11-5. How does a team do that if the QB doesn't make that much of an impact? There's a reason why the QB now gets all of the attention and the NFL is considered a QB-driven league. The Steelers went 6-10 in 2003 and 15-1 in 2004 once they found a QB. The Broncos went from a decent 8-8 to a Super Bowl contending 13-3. Cinci went from 4-12 to 9-7 with a solid QB (Dalton) at the helm. Do you honestly think Green Bay has had top talent in the NFL every year since Brett Favre became a starter? Do you think the Patriots have had top talent since Brady became the starter? Did the Colts magically have NOBODY for one season but have otherwise had top talent since ~1998? New Orleans went from 3-13 to 10-6 when they got Brees and have been pretty good ever since.
It's a QB-driven league and the top QBs rise to the top. Their teams come along for the ride. I know that you haven't personally watched a team with top QB play in all likelihood (as a Skins fan), but that's how the league has worked for 20+ years since Marino, Kelly, Montana, and others started the QB revolution.
That's the thing; there are NO earth shattering moves. There is simply adding youth and depth. Look at Bree's. He was good and became great because Nola built a really good defense AND got him a bunch of good young people to throw the ball to.
They add youth and depth every year. Brees became good in San Diego his final year. It had nothing to do with an infusion of talent. Then he took a TERRIBLE New Orleans team (3-13) and won the division the next season. Why? It wasn't because New Orleans was flush with talent. He turned a bad team around. Great QBs do that, regardless of their protection or the players on their team. It's all excuses. I think I remember recently hearing about the terrible OL in front of Rivers, but he gets the ball out so quickly that protection doesn't matter. Roethlisburger is running for his life all the time, but those are the plays where he escapes the pressure, extends the play, and hits the big one. You're giving a random what-if, I'm giving you example after example that proves my point. Even your attempted example (Brees) helps prove my point.
It's all about the QB, bout the QB (not his teammates).