I don't know, they had just slightly better QB play they'd be definitely 4-2. QB is the #1 most important position in football and it's not even close.
Mac's crucial errors this year:
-He threw a pick 6 against Eagles with zero pressure and threw high to Bourne. They lose by 1 score with the ball at the end.
-Dolphins He throws a horrible jump ball pick just after the momentum changing blocked kick with 1st down inside Dolphin territory. Again zero pressure. Have ball at end, can't score
-Saints game, who knows, I count this as a loss with another QB because 34-3 but first score pick 6, yes pressure but should eat the ball there. His Fumble leads to 3 points, another interception leads to 7. All QB's have turnovers BUT all 3 are in the Patriots end of the field and lead to easy points. Another NO field goal was on change of downs at Pats 31. 2 drives NO had -2 and -6 yards and scored 2 field goals. So Saints offense really earned 14 points and 17 of the other are directly related to Jones. With Kirk Cousins, even with ONE of his dumb plays' they might win this one, despite the lopsided score.
-Dallas-10-3 score, Mac then Fumbles into a Touchdown, had escaped pocket but had no awareness from behind and then later threw pick 6 for a touchdown when he had all day to throw and no pressure when throwing and now it's 28-3.
-Raiders-Rolled out, no pressure, open guy, overthrows, picked off, there goes at least 3 points.
Pick any top 15 QB and they will make mistakes, but Mac's crucial mistakes come most of the time with no pressure and no reason to blame the line or receivers on almost all the crucial mistakes listed.
So with any top 15 QB the team is probably 4-2 and the other 2 games they would likely have been at least in them. Despite the Oline and the receivers and the injuries.