Between the fact that this staff was all about bravado rather than actual schematic advantages, and the fact that a talented kid from a spread offense struggled in knowing wtf he was doing his first year under center?
We'll never know what he would have been under another staff so not going to get all into that. But I can't imagine a worse scenario for a young QB to fall into. And I recall Jim Everette saying in an interview early on when asked about the Rams' QBs, that Goff would at some point his rookie season be pressed into action. JE knew the score, that Keenum wasn't going to be some sort of answer.
In hindsight it demonstrates how bad Fisher's logic was wrt Goff. In Fish's mind he was "taking care of Goff" by redshirting him. But that was never going to happen. So he didn't get near enough snaps, focus, etc from day one to help him be ready that first season until it was too late.
It just would have been far better to adjust the offense to him his rookie season and what he does well, and give him the snaps and focus from day one in OTAs on. But it was a perfect storm unfortunately where you had a year 5 coach who had to win, a team that just relocated and desperately wanted to win, and a kid from a scheme that had a million things to learn being pressed into service under an offensive staff that was lost.
And you'll probably think I'm defending Goff here, but really I'm just calling it what it is. That we don't know wtf we have because of the way that whole thing was handled. It's miserable man.