I've studied Brazilian JuJitsu and had allot of fun with it. It's been many years since I trained and I need to get back and finsh what I started. But JuJitsu is from the ground fighting techniques used by the Samurais to overcome their opponant who was clad in heavy leather armor. Most of what I was taught revolved around pressure points, throws, bone breaking and grapling. I see no reason why a modern fighter in all of his gear couldn't use many of these simple and easy to learn JuJitsu techniques.