Whether a horse it tiring, or flying late, depends on what the horse was asked to do during the earlier parts of the race. It isn't a function of "class". If a horse contested the early pace...then it will tire late. And if another horse was reserved well off the early lead...then this horse will appear to be charging at the end. The vast majority of the closers are tiring too...albeit at a slower rate than the front runners around them.
To me..."class" is a fine balance between a horse's brilliance, and its consistency. IMO...the "classiest" horses are the ones who run big races consistently. It doesn't matter whether they fly early or late.
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"Theory is knowledge that doesn't work. Practice is when everything works and you don't know why."
-- Hermann Hesse
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