lucky fans prevent a too easy training regime of exactly 48 minutes/player.
Also it is better to have a lucky fan get on the court rather than having your player drop dead from to much play (in fact in real life people already died on a sportsfield, here in Belgium it happened to a famous volley-baaler once!)
So if the stamina is not enough for 48 minutes, it's best to have some back-up instead of playing your star to dead!!
Now, for this game. There is this thing 'lucky fan' since you now know about him you have the choice either keep playing 5 men and waste some minutes on lucky fans, or take 6 men to the game, and don't loose any trainingminutes to fans, but be sure a few players will not get the entire 48 minutes... It's what you like best.
They are not your friends; they dispise you. I am the only one you can count on. Trust me.