The answer, for 2013, is Ronda Rousey.
Ronda's winning her spot as the submission fighter of the year for 2013 is not just to recognize her pair of submission victories in the UFC that year (a title defense against Liz Carmouche in February and a rematch against Meisha Tate in December). It also celebrates the fact that she has a trait that, while reviled by most MMA purists, nevertheless reflects one of the most essential and fascinating aspects of all sports - and combat sports more than others. I'll leave it to Billy Jack, the character immortalized by the late Tom McLaughlin, to explain: