The Baddest Man in the BJJ World is Jocko Willink.
From September of 1990 to 2010 Willink was a Navy SEAL Platoon Commander and Seal Task Unit Commander leading hundreds of operations in combat. He earned his Black Belt in Brazilian Jiu-Jitsu from world champion Dean Lister, competed at the national level in Submission Grappling, and has trained dozens of professional fighters. He has also coached and cornered fighters in numerous King of the Cage, Pride, and UFC events.
Jocko started training BJJ in 1995 under the Fabio Santos. He then started training 2-3x a day.
He now owns Victory MMA together with Dean Lister. He is a black in BJJ under Dean Lister.
He is a lean 230 pounds and he used to tap out 20 Navy SEALs per workout. He is a legend in the Special Operations world.
Here is an interesting roll featuring Jocko with a nice submission at the end. You can feel the pressure:
This fellow Navy Seal tells Joe Rogan about his experience rolling with Jocko and describes it like rolling with a white Gorilla: