How about if global rank is not related to mod rank and you click a matchmaking mod where it pairs you with someone of simmilar 'elo' (i think elo is right word) and you play like 5 games then your both backed out of the lobby, You click matchmaking again and find a new opponent of simmilar skill. Say a rank 35 and 36 are paired and the rank 35 wins the majority of games, they would then go to rank 34 and the loser goes to rank 37.
This would reset everyone's global rank to 0 for now and people would start again only obtaining rank threw matchmaking matches.
The matchmaking mods could be random selection of 5 competitive mods, e.g wushu, aikido, lenshu, rk-mma, TK.
Mod ranks could stay the current way but are not effected or effect global rank.
Seems like a lot of work so I guess it will never happen XD