I know I do but, Linn, why do you do this to me? Why do you make me ship these beautiful things?

I can absolutely see Aegon making the position just for Orys - because he wants to give Orys a position that is (at least) equal to his sisters', that acknowledges Orys' contribution to conquest and rule, and, yeah, which enables him to sit the Iron Throne and be symbolically a part of and an extension of Aegon, as king. Aaah. And, yes, of course he wanted to keep Orys close. Ugh. Glorious.