I think you are both right. Because the triple extension frame is missing, but also given the knee and hips angles at the "takeoff" frame, it looks like there was no triple extension at all. I will film again when i get the chance and study it.
Again, when should the triple extension occur?
I think just as in a jump: right before the take-off and "during" it, as the heels come off the ground and you finish on your toes, you should be extended at all the three joints.
By the way... it's interesting, but when I think of the joints that are extending, and which muscles do the extension of each joint... I come to think of looking at the antagonists of these muscles and see how well developed they are in order to see how much ankle, knee or hip "functional" someone is. For example, highly developed hamstrings might show quad dominance, since the hamstrings had to develop in order for the quads to act explosively. Highly developed abs and hip flexors might show glute dominance/good glute involvement in explosive movements.
Who knows if there's any value in what I'm thinking...