I mean, both things can be true. Goff was so limited with the Rams that they built their offense around getting to the line ASAP, not to run as many plays as possible, but so McVay could literally read the defense for Goff, and tell him what to do. Not only did that stunt his growth as a QB, but absolutely no black QB gets a second contract the size of Goff's if they're even in the league at that point. And he definitely got caught up in what was basically a business decision for both sides of the trade. The Rams upgraded at QB, and the Lions got younger while they were in a spot that wouldn't have gotten them Lawrence, Wilson, or Lance in the draft.