Well. I looked at SDo0M's latest video. They don't move with the shoulder join as they should.
Another thing I notice is that the movement of the shoulder joint messes with the pauldron's polys. This needs fixing, cause as it stand right now, it could cause quite a bit of clipping that would become noticeable is Metal was ever used in Training more. Just separate the shoulder joint from the pauldron completely and re-rig it as a separate polygon.
By the way, I have been able to do just that with MS myself. If I could separate the shoulder joints and pauldrons completely, you can do it too.