Bill Walsh (one of my all-time favorites) was oft-quoted throughout his career for believing you can find WRs all over the place if you got it right at QB. Not a matter of brilliant or dunderhead-ey... just straight from the very smart horse's mouth. He said it right up until he passed away.
It really is the prevailing wisdom. A TON of personnel people loath the idea of taking a WR in the top 10 because, well... you just don't have to if you have a good QB. Green Bay and New England are great examples. Grossi brought it up close to the draft, that the brass was doing some handwringing about drafting a WR in the top 10, and a lot of teams don't dig that scenario.
Nobody's saying you don't want to be good at WR. They (we) are saying the performance of your WRs is MASSIVELY dependent upon your quarterback, and the teams with the best QBs win. That's not true of the teams with the best (or highest drafted) WRs.
Julio Jones is awesome. No doubt. His team did not win last year. Calvin Johnson is one of the top few, too... and his team didn't win last year. Dez Bryant. Larry Fitzgerald. Andre Johnson. A.J. Green. Josh Gordon. These are widely viewed as the elite of the elite. Are they facing off in the Super Bowl recently? Or are they actually more likely to not even be in the playoffs?
Meanwhile, if you list the top QBs (generally Manning, Brady, Brees, Rodgers, and now Wilson and Luck), they're in the playoffs every single year and all but Luck have won Super Bowls.
It's not really a two sided argument. I can't find any great quarterbacks having dreadful losing seasons because they didn't have an elite superstar WR. But no, that doesn't mean teams don't try to get better, well... everywhere. Including WR.
I think we're just straying from the point: If you get great QB play, you're gonna win. And a lot of teams get great QB play without investing extravagantly at WR. But the reverse isn't true: Having huge seasons from Josh Gordon or Calvin Johnson or Andre Johnson doesn't guarantee a playoff birth.
Do you think it might be significant that each of those quarterbacks you mentioned--with the possible exception of Wilson--have been in the same offensive system for multiple years. I can't say about Wilson because I don't know what Wilson ran in North Carolina State and Wisconsin and how similar those offenses were to the Seattle offense.
But I can certainly say that both Manning and Brees had spotty beginnings. Manning threw 28 interceptions his rookie year and went 3-13. But the Colts stuck with him and he rewarded their faith in him. I think it is significant that Peyton Manning has been in the same offense his entire NFL career. When he moved from Indianapolis to Denver, he took his offense with him. Think that might be a significant advantage to a quarterback?
What if the Colts had given up on him and traded him to a team that already had a decent quarterback, perhaps one that ran a different offense than the one he knew. What are the chances that Peyton Manning might have become a footnote in football history?
Brees went 8-8 in his sophomore year at San Diego and then after a disappointing 1-7 start the next year he was replaced by Doug Flutie. If Doug Flutie had not been 40 years old already and if Rivers, the rookie, had not held out for more money the following year, Brees would not have had that great year in 2004 and might also have been a footnote in football history--comparable to some of our past Cleveland quarterbacks.
Brady advanced from fourth string to second string and completed 1 of 3 passes for 6 yards his first year.The next year, he entered the game for the final series of the second game due to an injury to Bledsoe. He then had two rather mediocre games before he started showing his elite characteristics and led his team to the playoff. My guess is that if Bledsoe had able to return after Brady's first two starts, Brady would very likely have become a footnote in football history, generally considered a failure comparable to Tim Couch and Brady Quinn.
Now understand, I am not saying that Tim Couch or Brady Quinn might have been a Tom Brady. But I am saying that Tom Brady might easily have become a Tim Couch or a Brady Quinn, if his situation had been different.
My point is that changing offenses as often as Cleveland has changed offenses over the years does not contribute to good quarterback play. You say you want good quarterback play. I say it doesn't matter who your quarterback is. If he doesn't have a chance to grow in a system, he very likely will not give you good quarterback play. I am well aware that you often make the point that quarterbacks who fail here have not set the league on fire on other teams but I think it is likely that the ones who might have done well elsewhere simply did not get the opportunity.
The same thing can happen to Manziel if he is not given a chance to grow in a system. Without continuity, he will likely fail. He may fail anyway, but he is much more likely to fail without continuity. In my opinion, the absolute best thing that could possibly happen to Manziel and his future as an NFL quarterback is for Mike Pettine to remain the Browns head coach for the next 10 years.