Well yeah, thats an interesting example you are mentioning there. I think in practice Roglic will still be the number one by far, but indeed they mentioned that they will use two co-leaders. Ah well, maybe it does make sense to make Evenepoel co-leader.
But somehow I have the feeling that with Vingegaard you can call him co-leader and still have him a bit lower in the hierarchy than his companion. With Evenepoel, well my gut feeling for now says that he doesn't understand how that would work.
Regarding Rog and Vingegard, both have their best finish as 2nd in the tour. Rog cannot say he is better at the tour than can Vingegard based upon past results