That's correct. Most times tiebreakers are used involves 3 teams and the point totals will only be the two games that each of the three play against each other. In this case, Overton will not be in any kind of playoff scenario as they are the worst team in the district. Like the one poster stated, WS would have beaten Overton by 40+.
I believe 11-4A DII point max is 18.
Several districts are prepared to play two games in a week to make up any lost district games since the UIL waived the 5 day rule.