Everyone saying it's completely a myth is ignoring one question: Suppose there's a leader who's the oldest, their spouse is gone, and he/she has 6 littermates

Everyone saying it's completely a myth is ignoring one question: Suppose there's a leader who's the oldest, their spouse is gone, and he/she has 6 littermates who "follow" him/her. Then the leader dies. Which of the littermates becomes the new leader? Maybe the pack disperses? Otherwise there's a fight. Please explain how that's incorrect.