My vote goes for Monson, he fought 6 times this year. http://en.wikipedia.org/wiki/Jeff_Monson#Mixed_martial_arts_record
If counting only UFC fighters: -Michael Johnson - fought Shane Roller, Tony Ferguson, Danny Castillo, will fight Myles Jury -Melvin Guillard - fought Jim Miller, Fabricio Camoes, Donald Cerrone, will fight Jamie Varner
Must really want back in the big show. He needs Jon Jones to teach him how to use his body properly. He has always had potential, and I wouldn't mind seeing him do better in the UFC.
All WARRIORS IMO. Considering athletic commissions regularly hand out 1-3 week medical suspensions following most fights...fighting 4 times a year means these guys took very little damage and were always in training for the next guy, just in case Joe Silva came calling.