it's a presidential system and the president choses their own cabinet. so it doesn't really make sense to have a shadow cabinet when you don't have a presidential nominee for another three years, so there is no one to select the cabinet to begin with.  it makes no sense to have the minority leader pick it, because the minority leader can't bind the future nominee in any way, shape, or form. and there is no guarantee that the future cabinet will come from the house in the first place.  funny that you're in this thread but you know fucking nothing at all about how the us system works.
Pirate