Well, if this is the case, then wouldn't a person who gets out to an early start have a tremendous advantage over the rest of the group since she'd be swimming largely without interference for the first length of the race while the trailers would have more turbulance? Also, I've never understood why there aren't more standards for Olympic tracks / pools / gear. For example, everyone should be required to train in and wear identical apparel when in a timed event like swimming so that nobody gets a technological advantage.