I think the reason the double elimination thing keeps coming up is because we all assume there is one leg in Uganda, and 8 teams were spotted going to Uganda or in Uganda. Unless one of these teams was a decoy.
Three options:
2 legs in Uganda, two teams eliminated
1 leg in Uganda, one team eliminated and 7 teams left Uganda, and we missed one at the airport
1 leg in Uganda, and we only had 7 teams to began with (One was a decoy)