These are all really good posts, i am impressed!! and i can only aggree with most of the written stuff. however, concerning to the stiffness of pa glides, if he has a hyperlordisis in lumbar spine, the facett joints are locked anyway, because of increased shear/pressure on joints. the ab´s might be overstretched, so strengthing of all abdominals would be important.
Most important: check his Gym programm, make sure he is strengthing all muscle groups the right way, not only six pack etc., deep muscle groups and main stabilizers!!! also make sure that the hip joints have the appropiate ROM in all directions, because if not he compensates with lumbar spine.
the same for thoracic spine ROM. If stiff, his numbness of forearm may result of compensation of cervical spine.
good luck!!