Actually, i think you miscounted Manalo's losses. I count that he has 81 losses. So I did the math, and here's the dealio...
These are the current GLIs...
Busta = 3.94 (71 losses in 18 matches)
Marlon = 4.50 (81 losses in 18 matches)
Efren = 4.33 (39 losses in 9 matches)
So...if Busta wins his match and Marlon wins over Efren, then Busta is guaranteed to advance to the finals because he'll have a lower GLI than Marlon even if he wins 8-7 and Marlon wins 8-0.
If Busta wins his match and Efren wins over Marlon, then the GLIs really come into play. From my math, if Efren loses more than 2 racks, then Busta is guaranteed to go to the finals even if Busta wins 8-7. If Busta loses only 3 racks or less in his win, then he is guaranteed to advance even if Efren shutouts Manalo.
If Django loses, then the winner of the Marlon and Efren match advances.
The only way for Marlon to advance to the finals is if he wins against Efren AND Busta loses to Mika.
WOW...this is close. Someone please check my math.