It does make sense.
The six players have a round robin.
The top four players in each league have a semi-final and final to determine the league winner. Melling was fourth in his league round robin, but won the semi-final and final.
Players who win a league move to the winners league. So Melling won league 1 and moves to the winners league. He waits until all the other 5 leagues are over, then the six league winners have their own round robin.
Players who come in 2nd through 5th move into the next league (2 in this case.), and are joined by two new players (Fortunski and Alcaide). they will play off today, and that winner moves to the winners league, and 2nd through 5th move to league 3 joining two new players.
The person who comes in 6th in each league is eliminated.
When the winners league plays, they'll do the same round robin again, together with a semi-final and final. There will be an overall winner.
There's money for people who place in each league, and money for the people who place in the winners league.
Overall though, it means a tough tournament every day.
The overall winner will have won against the top players more than once.