Outside of a few comments from industry writers, and fans’ comments such as yours, Ruffian, I have to admit that I’m not familiar with this horse. Sounds like he’s a good one though; any horse capable of winning at age 8 is impressive.
Actually, being in the Eastern time zone, I usually pay attention to tracks that are in the east: Woodbine, Aqueduct, Belmont, etc.; and even then, I’m not as familiar with the American tracks as I could be. That’s my excuse for knowing Kona Gold only through others’ comments, but perhaps it allows me to look at your question without being too partial.
One thing I have found about “legendary” horses is that they need to do a couple of things in order to attain “legendary” status. First of all, they have to win, and they have to win important stakes. Secretariat, Cigar, Izvestia–Grade I stakes winners all, and each impressive in his own way. I can’t recall very many Grade III stakes winners though.
But secondly, they have to be successful with breeding. Northern Dancer was both a Grade I stakes winner and a successful sire, for example (IIRC, Dance Smartly, a Queen’s Plate winner and a Distaff winner in the Breeder’s some years back, was of Northern Dancer’s bloodline, as have been many other successful horses even further back: Nijinsky II, Russian Fox, among others). But, IMHO, that’s why we remember Northern Dancer: because he could both win, and produce winners.
And that’s why few people remember Izvestia. Canadian Triple Crown winner, and one heck of an impressive runner, but he broke down in a race as a four-year-old, and sadly, had to be put down. No career as a stud, so we don’t see his name come up in the pedigree lines of the PPs, so we’re not reminded of him as much as we are with others. (Sorry for all the Canadian references, by the way, but that’s the racing I am most familiar with–and I was at Woodbine to see both Izvestia and Dance Smartly win, so maybe I’m a little biased.
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Anyway, there are my thoughts: a “legendary” horse is a winner who can produce winners. Just my opinion, and your mileage may very, but it answers your question in a very roundabout way: as a winner, Kona Gold has fulfilled half of the requirements for “legendary” status. We’ll have to wait a while to see if he can fulfil the other half.