Sure, I´m just talking first round (next update/unexpected scene).
My guess is it´s gonna be 3 fight preliminary and then Semi´s and Final. Total of 5 fights, maybe 6? Some rando to start, then maybe Robert (or another rando), then Mark. Semi vs. Jeremy and final then maybe Marcel (if he takes part) or vice versa, if there is some rule that guys from the same gym can´t meet until the final. Maybe some surprising character in between like Dave or Lena´s brother. Personally I don´t see Mike, Axel or Jack as the types to take part.