I thought assists from both players would be sumed too, but I do not mind if the total assists of only the best out of the two players will be considered.
One thing for sure though, this competition is not fair as such because some teams faced tougher competitions and opponents while others had significantly easier ones. Another unfair thing is that it is likely the the rich accounts will win and the poor will become poorer because this competition favors those that already have a lot of resources - they are the ones that have the most advantages and best odds to win this competition given that they can have (or already have) players of big quality difference compared to their opponents.