Mac Jones isn’t the main reason the Patriots are winning. Far more importantly for a rookie quarterback, he isn’t a reason they are losing.
This Patriots squad is fueled by Bill Belichick and ferocious defense. Only four teams boast a better defensive DVOA. They have more interceptions than passing touchdowns allowed, and are permitting a 75.7 QB rating against. They are one of seven defenses to permit fewer than 7.0 yards per pass, and have surrendered the second fewest rushing touchdowns (five). That is the engine of this team.
But Jones is proving to be an able conductor.