Orga will last till the final stretch of the story. Naze will surely die for him should something happen. I agree that Orga will remain loyal to Tekkadan and remain a bachelor. In hindsight I suppose it was a bit of a stretch to put Orga on the same level as Merribit in terms of experience. Her counselling has always been so one-sided that there's no room to return the affection.

Poor Orga ends up sacrificing his life for Tekkadan despite being alive.