In additional to in game stamina what if each kong had a confidence meter. This would be adjusted accordingly with the kong’s actual in game performance vs their expected stats per boost.
For example, if a club has a 240+ boost kong sitting on their bench because it is division 1 club with higher boost Kongs playing more minutes, they would not be putting up as expected stats - as a result start to perform temporarily poorer over time.
It would create a different strategy for club owners building a full club with a range of boosts. As a kong owner, it would incentivize you to sign with a club that will play your kong as expected. It could give the 175-200 Kongs more value in becoming the “6th man” for clubs in higher divisions. This then creates demand for certain unhappy kongs signing elsewhere during scouting/free agency/offseason periods.
Down the line this could also be a key indicator if a kong is on a hot or cold streak.