That is very possible
It appeared that Goff struggled mightily in quite a few games after the Miami game last year.
Talent is great but confidence is even better. Bad losses and public humiliation can crush confidence. And sometimes a confusing message can stifle a way out.
"Don't turn the ball over....protect the ball....stop giving it up"
"He doesn't throw downfield enough.....reluctant to go for it when it's tight"
A 12 year vet might say, "yeah, okay coach" knowing 'if you want me to take those chances, you gotta accept when it doesn't work out'.
A 5 year vet maybe not so much. May be reluctant to take a chance when a turnover could set his HC off. Isn't there a saying like, "when you're thinking too much, you're not playing your best"? If there isn't, there should be.
Hey, whatever. We now have the 12 year vet and I like what I see. Except when he resembles a 5th year guy. But when it does work out, it's pretty and we win.