Lol no one understood the question properly.....
Everyone, what OP is trying to say is that when RDS was released by Oro these came out:
1. Hashi
2 Tobirama.
3. Hiruzen.
4. Minato.
But going accordingly, Oro's hand, Hashi and Tobirama should've remained inside Hiruzen just the way Ying Kurama is still inside Minato.
1. Oro's hand, Hashi and Tobirama was sealed inside Hiruzen first, then into the Demon.
2. Ying kurama was sealed into Minato first, then into Demon.
When RDS was released:
1' . Hiruzen, came out of Demons Belly. Then came out Hashi and Tobirama who was actually sealed inside Hiruzen.
2' . Minato came out of Demons belly. Then why didnt Ying Kurama come out who was sealed inside Minato? WHY?
WHY?? this is the question op has been asking.
Good point OP.
Now, I need to do some researches.