As I have alreasdy said, any drop would only be affected by the number of games. For instance, if there was only a 100pt gap and the higher rated player lost one game from five there would be no drop (or a negligeable one at best) but if there was a 500pt gap and the lower rated player managed to take one game from five, they should be rewarded for their achievment. In the real world high rated players have to keep their guard up all the time, so why not here?
Surely if there is a 500pt gap and thew lower player runs it very close this should be reflected with a ratings change.