Experimenting with a method for taking/exposing the back
I've been playing around with something lately with a few blues and have had limited success with a couple of purples and I wanted to bring it up to get any feedback. Many of the posters here also watch a lot more video than me so I'd also appreciate links to video from competition of instructionals.
Here's the deal: I've been using my knees and driving into training partners to get them turned onto their stomachs completely flattened out. I originally thought I heard about doing this from a blackbelt but I think I actually misunderstood him and ended up with something different.
More detail: From mount or side I'll get a big brother grip on an opponent's arm; big brother is where, e.g. from mount, I'll underhook my opponent's head with my left arm and grab their right arm and pull tight. It reminds me of something my big brother would do to me. With the big brother grip I'll pull my opponent to their side some, exposing their back. From that position there are a variety of ways to take the back which at the crudest level basically involve pulling your opponent onto you. From the grip side I mentioned what I've tried doing is hopping off mount to side control on my left. I then base out with my left leg and drive my knee into their lats just above their spine while also pulling the grip through. This turns them onto their stomach BUT with them completely flattened out. Since you're driving them down with the knee when they flatten out you also end up pulled over them with position (but no hooks). The main issue has been that they're so flat getting hooks is hard. However, they're usually so prone that you can get a choke without the hooks.
Has anyone seen something like this or seen competition footage of someone doing this that would perhaps flesh out technical details? I haven't done this on the more experienced browns or talked to my coach about it yet so I might be missing something obvious.
edit: basically what I call taking the big brother grip: