Measured by me from the shoulder of the working material on the pad to the top surface of the pad using plastic micrometer:
Front: Inboard 1.2 mm
Rear: Inboard 6.2mm
Front: Inboard 1.5mm
Rear: Inboard 5.5mm
Dealer inspected pads while on the car and indicated that this was a normal wear pattern, even though I questioned the inboard pad wear pattern.
Further, the front pads show a markedly taper.
To scare me off, the dealer said they just had another customer with the same pattern, and they also concluded it was a "normal" pattern.
This suggests to me that the initial culprit of the original early wear was due to the caliper not functioning properly, not my mother's driving pattern. Local non-dealer brake specialists agree with my position. With the same driving pattern, the rotors show no indication of rust, so I am doubtful of the original claim. She drives about 50miles/week or about 2500 miles/year, I drive the remainder when I come home for long trips.
I have contacted the Subaru Dealer Representative. What should my strategy be with these guys. I wish to have the entire system replaced and paid for by the dealer (not Subaru), as I suspect the dealer is attempting to cover up their original incompetence.