Ok, since you didn't like the first answer, I'll say this.
I believe he's a guy who can win 10+ games and potentially be a guy who can win games in the postseason. I mean, we saw it in year one before they blew everything up here.
The book on him coming out of Alabama was the fact he didn't have the best arm, but he was smart and when given time and adequate weapons, he can be successful. Aside from year one, he hasn't had it since.
Shanahan has already proven he can do that there, and he's even done it with Garoppolo, which sort of speaks volumes given how he's looked in Las Vegas. In San Francisco, they have a stable offensive line and an incredibly stacked group of players, so unlike here, he'd have someone to throw to in critical situations.
Last year, that was Meyers. He led this team in dramatic fashion in third down receptions the last two seasons (look at the stat pages from 2021 and 2022). Jones literally doesn't have anyone he can look to consistently. Neither did Zappe, which is why both have struggled. They don't have anyone right now who can they can consistently count on to go to third down right now. San Francisco has that.
People are talking about the fact Zappe hasn't gotten a fair shake but all that's happened is he hasn't had to spend 60 minutes running for his life yet. The results are what they are not because he completely forgot how to play quarterback.
So do I believe Mac would be better there? Absolutely. And my fear here is that the blame is going to continue to be placed primarily on the quarterback instead of where it should go, and we're going to watch an extension of what's happening right now with someone else because they're also not going to bring in any serious help at receiver, even probably this offseason.
Again, I don't care about Mac. I care about what we're in for. Anyone who has watched this team well before Brady got here (or even Bledsoe) has already lived it. They're in step one of trying to find the next Brady. But you at least need to be able to live with OK to average until that happens. Because both "great" and "elite" are rare.