I would expect that wear would be roughly equivalent side to side, but given that
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the right front suspension has had extensive work - wheel bearing, hub strut and spring all replaced back in 2009 for "noises"...
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I suspect that some major trauma occurred to that side only -- hitting a curb at high speed, etc.
If it were my car, I'd work backwards: replace the upper strut mount with a new keyed mount (it looks like the drilling took out the key, not so much the key hole), and see what an alignment shows. Take it from there.