Yeah, I remember my back and forth with one of the (so say) SME on this issue when he said it was fine to mount to the focus ring.
I guess what Optics 1 had to say about that, vindicates my back and forth with SME.
I sure hope he reads your post on what Optics 1 had to say.
Haha my experience putting it on the focus ring of the 1531 goggles is that the COTI needed to be at the 6pm position or a slight bump, or even without a bump, would make you lose focus.
I have heard guys say the tactical dudes run it there to quick focus, and maybe that works on other units that have stuffer focus rings, but not on my pvs1531 or pvs14. Seems like a high risk for the benefit in a high-threat situation.