I let the main flock out briefly again this afternoon and Ichabod had a closer encounter with the pullets (they were still in their run), the most dominant leaving his comb rather bloody. This is the same girl who is the obvious feather picker and also the one who took the most time settling down when I first caught her at their previous home. She's had a lot of fight in her since day one and I'll be moving her to solitary after dark for a couple of weeks. Maybe I'm being overly protective of Ichabod but he's far too sweet to have to put up with that and even the two RSLs, even at their worst, aren't that bad. If solitary doesn't resolve this issue, I think I'm left with just one option unfortunately but rehoming her to be a problem for someone else isn't okay with me.
I'll also be able to tell how severe these issues may be amidst the other three once the meanie has been removed. I have a feeling they'll be a lot calmer without her.