I was digitizing some video of recent events I had on my DVR (BTW - Save anything you want on your DVR to other media because if your DVR craps out like one of mine did then you loose the programs) and I noticed something interesting about Tommy Gainey - he is nearly a model for HSS. He presets his weight on his trail foot ala HSS. Is is pretty much SA aligned at address:
But the really amazing thing is the minimal rotation of his lead and trail forearms through impact resulting in this impact position:
It is also well after impact before there is any significant lead arm rotation.
I doubt Tommy Gainey ever heard of HSS but he exhibits the key characteristics. Jerry Heard never used his swing but on tour (I saw him at a senior tour event) but Tommy Gainey is making something very like it work pretty well.