Just thinking here. If the lower seated player is to advance in the case of a draw, what happens if Al & Bob are playing a tournament match and Al is higher at the start, but then Al loses a regular game to Carl and his rating goes down to below what Bob's is. Al's was higher at the start of the match, but Bob's was higher at the end. So who advances?

Sorry, I don't have a good solution to this, just thought it should be brought up.