He is a fighter when he has to be but he prefers not to, that’s how I see him. He was prepared to fight at Shukai Plains because he saw victory in reach.
I think Hakuki and Ousen are similar in that regard. Ousen will fight if he sees victory, just like Hakuki. Ousen’s weakness is that he’ll just straight up retreat if he doesn’t see victory in front of him, but that doesn’t mean he’s weak or scared to fight.
Every Ou male we’ve seen in this series is a damn awesome fighter and Ousen will be too to some extent.