Alright, just to clarify all of this because that chart is confusing me to, I'm gonna try to simplify everything:
There are 4 multiple team tiebreaker scenarios that I can find at the moment.
1. St Bonaventure, Mason, and GW finish 10-8
2. Mason, GW and La Salle finish 9-9
3. Mason, GW and Davidson finish 9-9
4. Mason, GW, La Salle and Davidson 9-9
In scenario 1, the seeding would be: 5 - GW 6 - St Bonaventure 7 - Mason
In scenario 2, the seeding would be: 6 - GW 7 - Mason 8 - La Salle
In scenario 3, the seeding would be: 6 - GW 7 - Mason 8 - Davidson
And in scenario 4, the seeding would be: 6 - GW 7 - Mason 8- La Salle 9 - Davidson
So pretty much, the only scenario that really results in Mason getting screwed if they win on Saturday is if Bonaventure loses to UMass AND GW beats Dayton
EDIT: whoops, scenario 1 is for 5-6-7, not 6-7-8