Just my $0.02
McCarthy feels like another Bo Nix and Mac Jones-type. And I know Mac Jones had an awesome day yesterday, but ultimately those QBs will thrive and succeed in great systems with good offensive coaching and good talent around them. But not really guys who can "elevate" a team on their own and probably won't be elite guys. Still guys you can win football games with though and probably make deep runs in the playoffs here or there.
I still think the Pats and Belichick screwed Mac over. He's not elite but not as bad as made out to be. The Judge/Patricia coaching fiasco, Belichick not talking or coaching him up, the lack of talent (his best receivers were Parker/JuJu, lol), etc. I mean, in 2021 with a better OC (McDaniels) and some talent around him and a decent O-Line, they did go 10-7 and make the playoffs. With this Niners team and with Shanahan, Mac could thrive. Bo Nix thrives with Sean Payton and some of the talent around him. KOC is a QB-guru and great offensive mind as well which benefits McCarthy.
I still think Maye has the overall higher ceiling than them. Does he reach it though? We'll see.