Most horses that I have seen in horse racing are of a darker color or have a deep shade of red-brown (like Secretariat). Is there any specific reason for this? Have there ever been any light colored champions?
As the others have said, the color of a horse plays no part in determining. One of the greatest horses of all time, Man o' War was a chestnut colt and they are far lighter than bay colts like Zenyatta.
Answering your own questions now?? Seek professional help.
Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them