I shamelessly copy-and-pasted this from a post zn wrote about 7 months ago. Any discussion about how 2nd contracts for QBs is affected but how much a QB has done is gonna have to account for this:
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In 2013 and 2014 Wilson and Seattle had been to the superbowl twice, winning once. In 2015 he was up for his 2nd contract and got about 22 M, which at the time was about 15.3% of the cap.
Meanwhile in 2018 Garappolo got 27.5 M, and that's after starting (at the time he signed) 7 games total in his career. In 2018, that contract was around 15.5% of the cap.
Superbowl winning qb, and then a qb with limited starting experience, and they got the same rough percentage at 2nd contract time.
AlbaNY_Ram