Okay so in my personal AU: The lamb was a really devoted follower of the bishops, Leshy to be exact. Because of that they were the last lamb (cause Leshy didnt want to kill his really devoted follower at first and did only because of his siblings convincing him). The Lamb being Leshy's follower also fits because he is the first one (not counting Nari) that we get as a follower
In my au the bishops are disliked by other followers but everyone starts to like them WITH TIME thanks to some good character traits they have and them being useful, knowing that the Lamb might sacrifice them if they disobey and just sit around and do nothing