Oddly enough the fighting stopped "after" I began offering a cookie for coming into the paddock! With winter coming & upcoming time change, I'd decided I need them to come in when I call. Ecspecially as Merlin is invisible in the dark. Going out to get them would soon be difficult at best.
For the most part it appears Merlin is the boss of the pasture. At dinner however, Pippin who is a faster eater, will move in to take Merlins. I watch over dinner with my little crop. I've only used it once, he still peeks up to see if I'm paying attention LOL.