His idea of the mechanism where the caliper could damage the rotor is for the piston to remain extended, and not retract after braking. This would keep the pads in contact with the rotors, causing overheating and warping. It actually sounds reasonable to me.

I did not notice any uneven wear on the pads when I replaced them. I will post something next weekend regarding the condition of the pistons, but only on the front wheels.

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1989 560SEL (172k)
1989 325IC (122K)
2004 Suzuki Volusia LE (3500 miles)
2005 Yamaha Road Star (20 K miles)