well they could drag it out for a long time like most shonen jump comics.

for example the ducks win: japan wins the youth championship, hiruma and kurita plus any other 3rd year graduate leaving sena to captain the team and recruit more players. devilbats win christmas bowl again, sena joins the nfl has to fight against hiruma.

or

rocky loses the fight: sena sad for awhile, monta cheers him up, captains devilbats, christmas bowl, win youth championship, sena fights whoever he fought with at first youth championship,

or

Monta X Sena: Rape MAX!
Monta would be the uke of course.