I have seen too many promising horses go sour and too many good horses lose when not expected to lose. I am sour on any horse being the greatest ever as all are subject to injuries and breakdowns at the worse possible moments.
You too will lose confidence in greatest ever thories when you are in the game long enough. no such thing as a sure thing. I had to endure the pain of horse breakdowns too much in my time and I had to grin and bare it to make a living.