I didn't mean to imply that it was a mental thing. He's obviously smart enough to go to school at Cal. And his football IQ is off the charts in my opinion.
What I mean is that the intricacies within each play call are far more complex. A play can be called in the huddle, and often the protections, audibles, and hots can be determined by personnel and formation.
So you could have the same play called twice in a game from the same formation, but say the first time you have Shorts in the slot and Strong outside him. But then the second time you have Griffin in the slot with Shorts outside him. That literally changes everything about the play despite the fact that the call in the huddle was exactly the same.
In the first scenario, if you read blitz from the strong side then the slot immediately becomes your hot. But in the second scenario, you can pull the slot down to the line as an extra blocker and change the protection instead.
That's the kind of stuff Goff needs time with. Because the offense at Cal is just too simplistic for him to have had many reps with that kind of thing.
I also wish he were a more realistic option. I think he's the best QB prospect since Luck. And I'd be willing to bet on it with the necessary draft picks if a trade were possible.