But David was different. He could be said to be a monster in human form! His body had undergone numerous genetic modifications and enhancements, strengthening his cells to a limit beyond comprehension.
Back at the Mother World, he could feel his body had been strengthened so much that he was starting to reach a limit. If his original body hadn't been destroyed back at the Mother World, he would have reached his limits after a while and therefore exhaust his potential.
Now, he had the chance to start afresh, in another world with even better resources and practice manuals, and he naturally would become even stronger than before!
Not to mention his werewolf form, vampire form and his hybrid form, just his body alone had been strengthened by the Ultimate Gamma Radiant Physique Technique and he could deal with a cosmic rank expert with the strength of his body alone.