the wind direction can be a big factor, one week your birds may have to fly into it, when it blows someone else's home, next week it may be vice-versa. Remember also if a good fancier has an ideal drop so that his birds can fly unhindered into his loft, he will take 2 minutes off someone who's birds have to fly between houses,trees and other obstacles in a small back yard set up, to win in sprints thats all they need. So yes a good position can be a big advantage but only on certain days when the wind is in your favour