It just makes sense, ha.
But I think it becomes confusing when you can use XP to improve fighter stats and open a gym. The two are very different areas of the game.
Personally I would prefer XP to be totally separate from the fighter’s stats and training.
A boxer can improve depending on their dedication, activity, ability of coach, quality of gym, relationship with manager and coach, and their potential. I would prefer it if the fighter stats went up and down depending on those things. It is out of my hands to some extent as a manager, but there are things that I could do to influence it. This feels more realistic.
XP - or ‘manager status’, or it could be called ‘social capital’ (to represent the manager’s status and position in the sport) could influence other things. Mostly, it could influence the quality of fighters who want to sign with the manager. It wouldn’t make sense to lose some when you sign one - if anything it would go up. Maybe goes down when you lose fights or a fighter refuses to sign a new contract.
But there could be some rules in the game about what you can do when your XP gets to a certain level (totally unconnected to fighter stats). It could ‘unlock’ opportunities. For example, maybe you need a certain level of it before you can open a gym in another country (or other things that could be added later, like TV contracts or Sponsorships).
Just a thought - I know it’s drastically different to how it works now.