I'm hoping it's like the order of entry = order of fight, so the girl whose name I still can't remember will fight this guy next. Remember there are 6, so possible out comes:
1. Medaka downs all 6.
2. Medaka downs 3, one of each of the other three.
3. Medaka, Akune, and girl each down 2, Zen does nothing.
4. Medaka downs 2, 3 of each for the other 3, and one of the 13 seniors defect (little dude with the mask doesn't look that evil @__@).
Rest are variation of that. Don't think there's a problem as long as Medaka doesn't tank it the whole way, also keep in mind they don't all have to be fist fights ... I think. I care less personally as long as Zen has
significant contribution to downing the king.
EDIT: Apparently I missed one of the random senior 13s that got one shotted in an early chapter, and Unzen is already beaten, but might be other senior 13s floating around (pretty sure there aren't though, but they never said the total number).