I am no doctor, no specialist, nor am I an expert in weight training. I am simply an advanced novice lifter who is following practical programming, so take anything I say here with a grain of salt.
I think he should so the full program, because it is a balanced one. Sometimes injuries and pain in one area can be a result of stiffness, weakness etc in another, so my doing a full program he is 1. developing a balanced musculature 2. covering all potential areas that cause pain.
my 2 cents.