[Bob Steele]

I'm not trying to be pedantic but in semi-finals the average score of all 3 matches are ranked, not just the best 2 of 3.

Of course you are correct! My bad...

I am just not sure why it was OK to do everything else by average score but not the finals... I guess it was so everything could march on a predictable schedule until the finals. After all of the tie breakers I would be extremely surprised if they still end up with any ties in quarters or semis....

In my summer robotics class competition I always used a double elimination tournament which could allow a team to come up through the losers bracket to win. They did have to win twice in the final to do it though... I guess this is the:
full double-elimination repechage. The winners bracket winner vs the loser bracket winner in the final.