It really depends on your hand size. For kyle, his hands were a bit smaller than mine, so his OSH pointer finger is touching the trigger guard. For me, the OSH pointer finger is touching the frame/grip.
It's a pretty unique technique I've never seen or heard of. I used to hold my OSH grip like most shooters do, all four of the fingers (OSH) under the trigger guard. Since learning it at the course, I've found the "defoor grip", as I will call it, to work very well.For me, what the Defoor technique exceled at was not only recoil control, but prevents "grip slip". Sometimes on really hot days, I find my OSH grip to slip on my sweaty hands. The Defoor grip minimizes that, again, for me. The other day I got a really work out before I went shooting and my hands were, well, very sweaty. I did the fast drill cold and realized my OSH wasn't slipping. When my hands aren't wet, I have no troubles with my OSH grip slipping.
Yeah, some noted they were getting better recoil control. I know I do, for some reason, I was able to track my sights a bit faster than I normally do. Either my eyes are getting better at tracking or the grip truly controls a bit more then the standard OSH fingers under the trigger guard.
Again, that is my take. Could be different with you!