Dancing City is an excellent example Mike007. A multiple Grade 1 winner over hurdles who would have been the star of many smaller stables. But major jumping flaws surfaced during his novice chasing campaign, and whether Mullins was taking a wise decision by running him in the bet365 where he fell fatally is certainly debatable.
There are many other Mullins horses who have failed to live up to expectations. I have no interest in knocking Mullins who, like Henderson, is an exceptional trainer. But none of them are perfect, and it is a risky sport. Keeping any star fit and well for a long period requires both skill and luck.