I think there's one angle that is being missed or dismissed here. And that is some trainers do better with some horses.
You see it all the time in professional sports, tennis & golf especially. All of a sudden a average player shows great improvement when they change their coach. Sometimes it's a better match, some times the coach see things or stresses things the last coach didn't. Some times the player is just happier. Can horses be happier? Why not.
I'm not a horse man, but I would think if you listed all the things trainers do or can do, it would be a mighty long list, legal things that is.
My guess is horses that move forward, for the majority, are simply just that.
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Don't sweat the petty things and don't pet the sweaty things.
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