Tim is correct. Within a tournament itself, there is no way to distinguish a league player from a non-league player, as far as points go. Actually, the only distinction that can be made is between players who are in your database and those that are not, but that distinction can't be determined by the points formulas, etc. League membership cannot be determined.
When stats are run, stat are only collected for players in your database. So, in this way, all points collected by non-database players are discarded. Don't know if that helps you any...