I read a stat (the stat itself was from 2018 I believe, so it may be dated now) that said in the last decade no Super Bowl winning team has ever had one player take up more than 14% of the salary cap. Goff right now takes up 14.3% of our cap space. Luckily for us, Goff's cap % falls under 14% over the next 2 seasons. That stat alone doesn't justify taking a rookie QB and having the rookie wage scale, but it is food for thought.