He has mastered all the jobs and reached level 63 in only 35 hours or so. Then again, if he's playing a single-character challenge, doesn't that mean Butz gains EXP faster? But really, Shinryu and Omega are both, at least to me, about killing them as fast as possible, before they kill you. Quick + X-Fight + X-Fight will do a lot of damage to both special bosses, especially if you combine that with the Thunder Sword ability when fighting Omega.