As it stands, there is no ranking system in wgt, except the one that genorb periodically updates for top 100 legends. I believe wgt should introduce a rank number for every player, based on his or her average and other relevant variables, like the number of rounds played within a given tier, and the relative difficulty of these rounds. This rank number would appear next to a player's name, but also in a complete list of wgt players, presented in descending order, from first to last, according to their respective ranks.
All this would further motivate players to be more competitive, and perform better, to achieve a higher rank.