heck- the top US sprinters don't much, Missy/Jenny both went to other frames.
Also, Dave is the man and already got back to me.
re, who gave input "Sarah yes, Bobby no. Actually it was Phinney, Friedman, Pearce back when development was underway in '07"
re: what kind of input, "Mostly geo and position. We got stiffness input from Oly sprinters Giddeon, Watkins, Njsane. Enduros don't need stiff"
so, there you have it from the man on the spot..