I am a fairly slim/skinny with a high muscle % and low bf%. I don't have a belt or any formal submission training I've only practiced techniques that I learned via internet videos. So I am not qualified to answer this question, but:
It occured to me that by having a big belly(Roy Nelson
)you would be able to create more leverage against the arm giving you a larger range of motion to bend it against the joint.
I was wondering if anyone here has a black-belt or other qualifications(big belly) could tell me if this is a correct observation?