Very real possibility.What I had in mind was the drawstroke to get to the SOB holster puts your arm into an armbar(chicken wing position). That may get your arm pinned under your body or barred by the BG.
I agree going for the gun probably shouldn't be the first thing, very timing dependant among other things. Things like fouled draw, muzzle averted etc.... are usually the result. Of course if your gun gets pinned between you and the ground, that's bad no matter where you carry. I agree that you will have to use your empty hand skill, etc... to get a tool into play. I think that's what you were talking about in your last sentence.
Yup.
That said, I have seen the draw from the strong side and appendix carry work from the ground.
Many modes can be made to work from a disadvantaged position, you may need to fight your way to your weapon though. Few are the people who consider this, and fewer still... who seek out instruction or practice it.
I hope you do not take my posts as a challenge to yours, I am simply "adding" some information I think might help everyone (not that I am an expert by any means).
I know that you seek out good training and are committed to learning. I applaud you for that.