To be honest, if you have seen Terrafirma 7, he doesn't look all that confident to me. Maybe it was just the cut, or just me.
RC's speed seems to come from his "staunchly" set bike, close to the ground, his "low" riding style (I mean skipping over the top of the whoops & keeping it horizontal in the jumps) & tremendous amount of time on the ground. I see Bubba as smooth as snot, but he seems to do a lot of airtime. However, if you watch him in slow mo, he seems to keep his rear wheel down a LOT, which of course matters.
Anyhow--I've got to say I'm a pro football, college basketball fan fiend, & it doesn't compare to what's happening in SX & MX these days. Once this thing gets recognized for what it is, including all its drama and personalities, it will be very successful. I can't wait for this year's SX season.