I'm not as confident as you that Reid wouldn't also have an elite defense because... more often than not, his teams have also had elite defenses. And they're typically able to do that because Reid doesn't need a ton of resources to make a good offense - even these Chiefs teams, outside of one year, have had an average or above defense. It's not like Reid goes somewhere and the team becomes the Manning era Colts.
I think you need to better calibrate what a Hall of Fame level QB is if you have McNabb and Vick in there. No, they're not. Not even close. You might as well put Kirk Cousins in the Hall of Fame if you think those guys are deserving. Also, Mac Jones is a guy who doesn't turn the ball over that much - do you think he has the same kind of season playing for Reid instead of BB? Regardless of weapons?
I'm not saying Andy Reid is absolutely a better coach. I'm not saying anything close to that. I believe it may be closer than we think, particularly in the current environment where offense is more important than defense.