Ranking Total vs. Average

Why does TM rank by average when the manual states:

Teams are ranked by total points.

Teams are ranked by total score at the end the of the Teamwork Qualifying Matches; at this point all teams will have played the same number of Matches, thus ranking by average and ranking by total points is the same. Throughout the tournament, TM displays ranking by average to give spectators an easier way to compare teams who have played different numbers of Matches.