This is interesting. As you start your turn by tipping into the turn by flexing the inside leg your knee will start to move up. Forward and up. In a circular motion. However, pulling the foot back before you start tipping into the turn would do the complete opposite, A circular movement down and back. So these two motions are directly contradicting. Also, I often hear people talk about foot pull back but I never hear the same people talk about foot push forward. How can you only keep pulling back? What goes back must come forward. If you think about it its a bit like back pedalling. BBs back pedalling theory holds true also when carving. Not only in bumps. And you also have to considet the transition type. ILE or OLR.
I don't see what you see. As you pull back, the foot moves back not the knee. For the knee to move back, at any kind of flexion, the inside hip would have to move back and that's the wrong kind of back. The hip should in fact move forward and up to stay countered, make some room and keep level with the snow. The correct hip movement is perhaps harder to coordinate with a simple pulling back and up of the foot and it is another big driver of tip lead.
At max lean you will be with the knee up to your chest and the foot held back
p.s. good you brought this up: the hip position is another element to help judge the tip lead in WC photos or anywhere... or that should be taken into account when judging photos. Tip lead is just the tip of the iceberg really, it doesn't paint the whole story of how you got there, which is the more important one...
Here's the (almost ) same picture from the back
Looking at the inside hip, guess where the knee is... and I didn't even point out the zero tip lead from whatever angle you want, here did I?
Edited by razie - 5/6/15 at 6:27am