Heck No! Rolls Gracie passed away in the mid eighties! Jacare was awarded his black belt by Rolls. Didn't mean to give anyone that impression, just that Jacare, got his black belt from him.
I see the thread has been moved to a more appropriate place. Thanks Jun, and sorry for the diversion.
Buildings and trailers and what not are messy. I always use the scenario as why it is important to train ground fighting. You enter a building with night vision googles on, you cannot see well, you trip over the crap on the floor stumble in the room fall down and wham, the guy is on top of you. Your buddy comes in next, can't see hears you yelling and struggling, you hold the guy there in the guard or something until they can secure the room and then he helps you. all this in under 20 seconds!
Here is a good article as an example on MSG Anthony Pryor, 5th SFG.
http://www4.army.mil/ocpa/read.php?story_id_key=1689
A good example of an army multiple opponent scenario.