I believe carlson and Carlos Gracie jr have a more athletic and aggressive approach to jiu-jitsu. Just look at who they produced Renzo, Ryan, Arona, Sperry, etc. Look at what what Helio produced, Royce, Rickson, Royler. Helio is all about leverage and defense and not use any power. Royce grapples like a slug compared to Renzo or Ryan.