Question about Bill Duff (co-host of Human Weapon)?

(Hopefully you've used to be a follower of Human Weapon, if not try not to give a snide remark, please.) It has been mentioned on numerous occasions that he is a "wrestler". So was he a professional wrestler or the catch-wrestling/greco roman kind? Jason Chambers, the other host of the show once made a brief remark about Bill's "old pro wrestling days". However as far as I know, professional wrestling has little or no value in improving one's fighting ability. If he was a professional wrestler why would Bill be so confident about winning his fights (which happen at the end of the episode as a challenge to the hosts) when all the combat experience he has comes from professional wrestling? I'm also puzzled as I watched another episode and he seemed pretty clueless about sprawling, which is a recurring move in MMA wrestling.