It's like the same situation with players that have siblings, if neither can behave responsibly and follow the rules the other can suffer the consequences with them until the other learns their lesson.
How about we ban all four of them ( Boltz_101KatsuCHARIZARD and Diam0nd) unless one of them admits to releasing and / or providing the information. If one of the players wants to let the others sink with them let him.