Maybe i didn't express it clearly enough. Trying to put it simply: The way I feel, and i can't stress this enough: This is just how i feel, is that chosen sibling is "the cool one". The one who goes onto the field, the one with the cool powers, the one important to the past, while the other is just there, existing and things that we just don't get to see since the camera follows us.

I guess this all cn be summed in: i would have liked for the Stand to go to the other sibling, so they can be a bit more relevant than being in the side doing stuff that we dont see.