GSP is a weird one for me this year. He's been dominant, but I don't think the level of competition he's faced this year has been that great.
K1 isn't MMA so you can't count that. I think fighters should fight at least three times a year to become fighter of the year. So I would go with Ben Henderson if he wins at WEC 53. From your list I would pick Edgar because he beat the man at lightweight twice. 1. Edgar 2. Aldo 3. Velasquez
Cain - KO win over Nog in 2:20 rd 1 TKO win over Brock Lesnar 4:12 rd 1. Wins HW Championship Frankie Edgar - UD win over BJ Penn (50-45, 49-46, 48-47). Wins LW Championship UD win over BJ Penn (50-45, 50-45, 50-45). Defends LW Championship Jose Aldo - UD win over Urijah Faber (49-45, 49-45, 50-45) Defends FW Championship KO win over Manny Gamburian 1:32 of round 2. Defendens FW Championship. Georges St-Pierre - UD win over Dan Hardy (50-43, 50-44, 50-45) Defends WW Championship UD win over Josh Koscheck (50-45, 50-45, 50-45) Defends WW Championship. I'm just voting between those choices because I don't feel like looking up everybody's performances. Based on the criteria of quality of performance and quality of opponent, I would give it to Frankie Edgar, just ahead of Cain. Cain had the better quality of performance with 2 brutal KO's in dominating fights, but the quality of Nog isn't what it used to be, and that was not a championship fight.