Lion is a by-the-books Operator because he doesn't trust his civilian instincts. Rules give him structure and allow him to control what he considers the pettier parts of his personality. They give him a safety net when conscience or arrogance could otherwise weaken his resolve and hurt more lives. Unfortunately, Lion still retains his arrogance and it has rubbed some people within GIGN and Rainbow the wrong way. Doc thinks he lacks the empathy necessary to help in medical crises.