If I can use internal skills to, in essence, be unhindered by whatever energy or attack my partner provides, then I am free to move as I wish.
If I can accomplish that, I'm not forced to "physically move" my body to gain kuzushi or to capture my partner's center or to destabilize his structure.
Could you expand on this? I don't get how your freedom of movement implies you can affect your partner without 'physically moving' your body. (And what do you mean by 'physically moving' your body? Stepping? Any overt physical movement?)