 However, a recurrent shoulder injury impeded him from recovering momentum, and in April 2005 he decided to leave the promotion.After leaving OPW, Gamma started appearing as a freelancer in Michinoku Pro Wrestling and Pro Wrestling Zero1, again as a villainous character.His activity in M-Pro was mainly outside of the rings, but he managed to corrupt the Sato brothers into turning heel, attacking The Great Sasuke and helping him form the group STONED.