Guess you’re thinking too complicated 
It’s simple: Because neither the ring nor the cable adjustment does have effect to the inner pad. The inner pad doesn’t move while pulling the brake lever.
Seems the function is intended like that:
Outer pad will touch the rotor first, with increasing force will the disc rotor be bent (!) and pressed against the inner pad.
I believe the gap to the inner pad should be kept as narrow as possible…and warped rotors are not suitable at that kind of brake calipers (Ok - maybe except floating ones)…