• Slide a centrelock rotor onto a hub spline and notice how much rotational movement there is. When you consider you have 2 companies making 2 different parts (one for rotor, one for hub) it doesn't take much of a machine tolerance difference to create some space to allow movement. Yes I agree that pads can move in some calipers .

  • Put a 6 bolt rotor on a hub with the bolts in only a few turns of the threads and see how much rotational movement there is.
    Hint: it's probably more than centerlock splines. The point is that they're both held firmly against the hub by the lateral clamping of a lockring (or 6)

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