Ill give you one scenario, I had a good horse that was set for a race, this is what I heard, trainer told driver go to the front, keep the front, and sprint at the 400. You have the best horse. Because my horse was about 6/6 in the betting no one gave it a thought, until the start when the driver went for the lead, the driver said after the race that he said to the leading driver, I'm going to the front as he was alongside the leading driver. The leader said I'm not handing up,the driver of mine said to him,I going to the front, the leading driver said you better not hand up.! Leading driver handed up the lead, my driver gave him cover until the final bend when he let it go with a crack and went on to win easily. Trailing horse finished mid field. You can see the drivers talking on the replay. Some of the words may have been expletives. It's quite funny to watch actually. So everyone has their own interests at heart.