Edit: Ooh. Oh. Lorca seems overly pleased at having taken a crew of scientists and made them warriors. Perhaps looking for validation if he IS from an alternate universe? Confirmation that it's NOT just him? That anyone would "turn" given the right circumstances?
Perhaps Lorca left the MU because he was too compassionate and gentle compared with everybody else, but he's turned out to be too aggressive and power-hungry for the Prime reality. Maybe he's looking for some way to bridge the gap.