Your buddy is correct regarding the MotoGP riders, It takes alot more (inside body position to lower CG, plus those guys weight 150-165 lbs?) to hold the bike over at 100mph in the tun that at the speeds most of us ride. Remember the bike wants to stand up and go straight (intertia) at higher speeds it is much more pronounced. 1/2 of a butt cheek over should take care of most Dragon type riding as it is rarely above 55mph in the turns. Knee draggingand excessive hanging off is for the track mostly although there are some who can use it properly on the road. (High Speeds). His biggest issue at the track will be ground clearance and long wheelbase. He will struggle.