'Three' seems to be the magic number of Gluttony. There are three Great Witchfiends created by Daphne: Hakugei, Oousagi, Kurohebi. They are based on the constellations 'Whale' 'Rabbit' and 'Sea snake'.
And so are the archbishops of Gluttony, Ley Batenkaitos (Whale, gourmet), Roy Alphard (Snake, bizzare-eating), and Louis Arneb (Rabbit, satiation).
Why are there three of the archbishops? I understand they each represent different aspects of Gluttony, but there should (maybe not) be only one Witch Gene of Gluttony. So like with the White Whale, can the Archbishops clone each other?
If this is true (I think I saw Angelo mention this theory somewhere) then Louis might be the 'main' as he is the only one not seen fighting and how he had taken over Rey's body.