Just a question from a racing novice:
I understand what drafting/slip streaming is as I like to watch all the Formula One races and obviously its a factor that applies to horse racing.
Lets say Black Caviar races with its nose up another horses butt, it's going to save a lot of energy.
If it races a length/length and a half behind another horse, wouldn't it use up more energy clashing with the front horse's turbulent air were the slip stream closes itself when all the air rushes in?

I quite often hear race callers mention that a horse is getting a dream run in say 4th position yet it has no cover as the 1st and 2nd horse are about 1.5 lengths ahead.

Does this make sense and what are other's thoughts?
Any help would be appreciated!