How much hip hyper-extension ROM is needed for gait, and when does it hit its peak in the gait cycle?

How much knee flexion is required during gait, and when during the gait cycle does peak flexion occur?

How much dorsiflexion is required for normal gait and when does it occur in the gait cycle?

If someone is lacking hip hyperextension, what compensations would you expect to occur at the knee?

In the frontal plane, the pelvis slightly drops on the swing limb. How does this affect that hip's frontal plane position?