ONE MORE THOUGHT--- and this is taking NOTHING away from Kirby, but Jim Leroy and Sean D Tucker do the closest thing to 3D in their routine. Especially Jim (my hero). He does super slow and low high alpha rolls as well as torque rolls/hovers/tumbles that are beyond description and extreme high G knife edge outside edge circles. Check out the videos on his website, but you really got to see it in person.

http://www.bulldogairshows.com/