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If you can rotate the disc centre relative to the hub, it's not being clamped by the lock ring. The rotor centre should be pressing on the hub shoulder with an axial load of about 10kN (27×1 thread at 40Nm tightening torque), acting as a clutch which would require about 60Nm to slip, which would be 750N tangential force at the rotor perimeter for a 160mm rotor.
gbj_tester
Sorry if the last video clip was a little confusing.
Look at the two white dots, one on the disc rotor and one on the hub. They move relative to each other with the brake applied and rocking the bike back and forth.