Sorry, I missed the part where you ttalked about different parts of the swing. I think Joe Mayo is talking strictly about the downswing.
You're not trying to swing your club 100 mph in the backswing so it should be more loose than your downswing.
I love this part!
A good drill that Erik or Mike taught me early on was to start swinging the club back and forth easy and fluid with loose wrists. Gradually increase the grip pressure on the pinky through middle fingers while keeping the wrists loose. You will find you can grip really hard without tightening the wrists. It take a bit of practice, but it is a good way to separate the muscle groups.
I get that feel ain’t real. But that doesn’t mean we’re all mindless sheep with no sense of feel at all. Proprioception can be difficult to pinpoint at high speeds but I damn well know that I’m not squeezing the blood outta my grips nor gritting my teeth on my backswing. I come down with the wrath of all that is evil, but my backswing is all about trying to be fluid and loose.
not sure how old they are (shrug) but i built a combo set of Titleist 690mb's and 716mb... the 690mb irons i was able to slowly buy here n there, and the irons are basically slightly used or barely used.. the 2 iron i snagged looked brand new lol..... the only reason i went with 716mb's for the 7-8-9 irons is because those in mint condition are hard to find, for older irons.. i dont ever feel like i am losing out on anything distance wise playing these...
my normal playing set is Titleist 735cm irons and i think they are about 10 years old and still play very nice... and like my other set, i dont think i am loosing out on anything with this set vs anything new....