Derek Carr - Why People Dislike Him (IMO)

He threw 5k yards in 2011.
The next 2 season, he complete 59.6% of passes, threw 49TDs (3.6TD%) to 36 INTs(2.6%INT), with a 81.9 passer rating. By this board's standards, he had 1 good season and 3 bad seasons before Caldwell got there. He also then has 3 of his best seasons in terms of QBR under Caldwell. Many saw Caldwell being the turnaround in his career.
My point is he already displayed that he could play at an elite level in this league before Caldwell got there. I’m not saying coaching is completely irrelevant, but I would say Caldwell with Stafford is a lot different than, say, Waldron getting the best football out of Geno.
Matt Ryan is a great example to use, as he was one that was also screwed by being in multiple offenses. Instead of mastering the way the offense works, they basically have to dump all of that to learn a new system. When he gets into a system that his perfect for him, Shanny leaves, they bring in Sark and the rest is history..lol.
I would say this is another good example of coaching making a difference, imagine if the Falcons hired Shanahan instead of Quinn as HC in 2015. That would be a significant rewrite of recent football history. The Falcons failed Ryan long term by bringing in a defensive HC, even though they got close to winning it all in 2016.

I know many on this board agree you want an offensive HC, because if your offense is good under a defensive HC you won’t be able to keep your OC for long. Compared to an ideal HC-QB pairing, there is no equivalent pairing on defense. Assuming the offensive HC is competent, the HC and QB grow together, continuing to build on the foundation installed back in their first training camp together. Having some stability at the skill positions also plays a role, QB’s and receivers continue to develop a chemistry that can transcend the playbook at times.