Without adding to either side of the ongoing “debate” (to put it nicely) on Triple Extension and its role in coaching the Olympic lifts, here is something to think about…both all-time great lifters, attempting World Record lifts, with very different extension of the hips and knees.
1986 European Championships: Shalamanov / Süleymanoğlu (145.5 kg) and Krastev (207.5 kg).
Figure from Bartonietz, K. Biomechanics of the Snatch: Toward a Higher Training Efficiency; Strength and Conditioning, 1996. Data from Weide, U. Mathematical modeling and movement simulation in weightlifting – Toward the further improvement of the aim technique for the Olympic snatch. Leipzig: Res. Institute Phys. Cult. & Sport (Dissertation), 1989.