My most dominant sow was my first (adult) piggy, Minx - she was a natural leader and explorer extraordinaire, always in the know about everything that was going on and very protective of her (cataract) companion. She would have made an outstanding herd leader; I always felt that she was wasted with just one companion!
Nia has been the leading lady of the Tribe since its beginnings, after a chin off with Taffy, who was at the time very much recovering from non-stop breeding and physically no match for Nia, even though she would have made a better leader.
Nia, her second-in- command Taffy, Llewelyn and later Hywel, Nerys and increasingly Telyn (before she died so suddenly earlier this summer) used to be the "council" of the Tribe. Since Taffy and Telyn have gone from the Tribe, Ffowlyn and Caron have moved up in the hierarchy. Hywel is in now actually the acting leader of the Tribe, more than Nia.
Taffy used to be very much the "mother of the Tribe", respected by everypig. Not surprisingly is Taffy the dominant sow of my Trio, even though she has advanced cataracts now. Tegyd very much defers to her whenever Taffy puts her foot down and Terfel is firmly kept in line!
I have always had a very dominant boar right at the centre of the Tribe whereas none of my girls is extremely dominant - they were primarily chosen for their ability to fit into the Tribe, as was Hywel for his job of leading man.
The price for having a working group is that the piggies are primarily focused on each other; they are not as cuddly as when you just have a couple. But watching them interact makes more than up for it!