I was surprised by the extent of the damage, but I think I’ve only read one other necropsy of a racehorse (Eight Belles, before they pulled it from the internet) so I don’t know what’s “normal wear and tear” for a 3 year old racehorse either.
I wouldn’t have thought Medina Spirit could have gone on racing for much longer, but Baffert seemed to think so. With all the imaging they have available, surely they could have seen at least some of the damage if they had looked?