yes the "brother out of nowhere" thing was very odd, and felt like something clearly invented just for the sake of this game. You can't imagine no one (Sully, Nate etc) would not bring up his brother before. Especially because Uncharted 3 already has a young-nathan flashback too.
Hopefully they don't make another Nathan Drake Uncharted now, his story is done and over.
Hopefully they don't make another Nathan Drake Uncharted now, his story is done and over.