Very very quick jump
Raptor, about the hip bend, I think it is in part due to genetics/limb structure. If you lok at the way cskin walks, his legs are slightly pointed outwards, meaning he has a glute preference. People with straighter legs, or legs pointed inwards may use the deeper quad bend more. Examples include Guy dupuy, maybe adarqui, AUT, myself.. it's hard for me to throw my legs out to much actually
I'm not sure about that. I still think Adarqui could get higher with more posterior chain, he's currently destroying his knees, (they look to be under extreme tension when he jumps judging by their position) in my opinion because of this high dependence on quads and their usage in jumping. To me, that's sub-optimal biomechanics. I know I'm on an island while saying what I'm about to say, but I don't really think it depends that much on the individual.
Yes, it does depend on the individual, but I think more in strength than in structure. I think in terms in structure the body will alter the jump stance (feet wider apart) and stuff like that, rather than muscle involvement. Muscle involvement depends on strength IMO.