If Buckpasser or Dr Fager's trainers came out and said "My horse is the best of all time", would anyone really care ?
Would newspapers hold the front page for this rivetting news item, I don't think so, I doubt it would even make it into print.
Would any punter in the US change his opinion of who he thought was the best just because some trainer has a different opinion., I don't think so.
You're right, news stories sell papers, but the opinion of every trainer in America as to which horse was better is about as newsworthy as the opinion of every owner and punter in the country.....noone cares.