It's likely Ozkaya is better in the corners Jason. Last week my drivers also switched positions and for part of my qualification lap one driver was better in some sections than the pole sitter who is normally comfortably faster. The track characteristics and driver specalities have a big influence on overall lap time, i normally decide on my best driver for the track in testing and then give them the lightest possible car because of this.
Car rank is calculated on all the parts that you develop. Some are weighted more than others as they play a bigger role. However when you are out on track, everything has to be taken into account.