People seem to be forgetting the most important part of groundfighting training here…
I have 5 years of wrestling behind me and 6 or so of BJJ.
Arguments about “what if,” aside, the question is not “who can I hold down,” but “who can hold ME down?”
The answer is "some percentage of the well trained grappling community, and not a big percentage of the population at large.
In a single or multiple opponent situation there is a strong possibility that I might fall. That I might be blindsided, or that I might trip over a chair or something. It happens to the best of us all.
I know how to fall, and I know how to GET UP, even when I’ve got a 300 lbs monster on top of me. And I know this because I’ve done it.
As Fatherdog pointed out, if you are stuck underneath somebody like that, you are in trouble. There’s no two ways about it.
The idea about groundfighting is not that the ground is necessarily the best thing to do…it is that with such training, you get to have a greater say in where the fight goes and remains.
Without it, somebody else might make that choice for you.
FYI, for the biters - doing that to get out of an armbar may be one of the worst ideas I’ve ever heard. It’s possible the guy will scream and let go. It is more likely, IMO, that what they will do, is scream and reflexively stiffen up. Think about it. When placed in a situation where somebody does something a bit unexpected, that is a threat your body tenses up and goes on alert.
If you are trying to get out of an armbar and the fellow has it locked in well, and you bite to try and escape they may break your arm out of reflex.
Incidentally, if you were to bite me and I didn’t jump and let go, I would absolutely break your arm for doing it. Then I would probably break something else out of spite.
Lastly, if the biting is going to work, it’s going to work to create space - and if you don’t know how to take advantage of that space, you’re very rapidly going to find yourself back in a similar position - with a person who is now quite ****ed off and highly aware that you are a biter.
I’m not saying that biting doesn’t have a (limited) role in self-defense. I’m suggesting that like any “dirty trick,” you need to know how to take advantage of the conditions it creates. And that takes solid basics.
Unless, of course, that person is a giant ***** and decides to quit becuase you bit them 