Why does ven look like roxas

My Theory :The reason that Ven looks so much like Roxas is that in Kingdom Hearts Birth By Sleep in the final episode When Ven goes into sora's heart and he becomes the half that Sora needed after giving half to ven because Xehanort separated the dark half from ven (at the beginning of the game)creating Vanitas, but in vens final battle when he defeats vanitas in the sanctuary ( inside Ven's heart) vanitas fades away and Ven fades into Sora's heart . then in the first Kh game when sora becomes a heartless he creates a nobody that has the Ven half of sora"s heart making roxas look like ven






please tell me if i over explained it