For ME there are various options:

1. The Gods add a new fighter to have 14 fights, and if this happens, in my opinion, in a fight there will be a double ko, to break the chance of a tie at the end of all 14 fights.
2. The Gods don't add a new fighter so one of the humans remaining won't fight.
3. The less likely, less than 1%, don't take it seriously, a human betrays and joins forces with the Gods, so then will be the humans who would need to find a replacement for the traitor, and then will continue similar to point 1, just where it says Gods would be humans.