BJ Penn: Enters his first prime at UFC 37 and goes UNDEFEATED for 7 fights. Loses to Machida, GSP, and Hughes from injurys and lack of motivation. Wins next 6 fights in 2nd prime until Frankie Edgar. (GSP II doesnt count because of greasing. BJ Penn Prime record: 12-0-1 Cain: Undefeated first 9 fights. Loses to JDS in flash knock out in injury comeback. (Not prime) Wins next 4 fights Falls out of prime against Werdum and Nagannou because of injuries. Cain Prime record: 13-0 War two of the most underrated fighters in UFC history.