Bukkit

v5.4.1:

Removed the feature that checked if a player disconnects whilst they are in the gym arena, that it won't remove them from the queue.
It was causing an un-expected issue.

If you remove the player from the queue, they will still have to warp or take them selves out of the gym arena.

There is currently no way to tell if someone has enough balance to pay the fee for the gym. I will look at getting an API for this, for now it just tells you if you receive the money, if you don't then they don't have enough money. And it is up to the gym leaders to make them lose the battle if they want.