The whole question is, can Nagan (and there's no one else) lure them all into participating?
And second, neither Nagan nor Neo nor Sag will find a single player among them who can play well on League-specific fixed maps. So, League will have a 4-0 score against everyone except Bay on their own turf, and something like 2-2 (depending on how the cards fall) against Bay.
So, the idea with fixed maps will have to be discarded.