If the cat is afraid, then by all means respect that they want the distance. If the cat has a healthy respect for S M, but is okay passing by like Larry was, then they are doing very well. I have also used a spray bottle with water to squirt in a stream as backup. If the behavior is very bad, like serious ongoing fighting or bullying, then you can put a little bit of vinegar in the water as well. When Bingo was attacked that could have put an end to Larry's tormenting her. It is a good deterrent in a bad situation. You have a lot of cats to blend, so a couple at a time is a great start. Don't be discouraged, it is usually not a quick process, certainly not with so many. Does S Mary come upstairs on her own comfortably at all, or is she pretty spooked? It is probably best that whoever wants to venture down there be allowed, encouraged to do so. Mommy and Bingo are not good candidates at this time. Two at a time is manageable; bring the spray bottle when someone new goes, but it is only to stop a full on battle. Hierarchies will be established eventually. Just be patient even though it's really hard to not get discouraged, just think of it as a challenge that you and they WILL eventually overcome. Also, talking to them while they're meeting - saying names and encouraging words can help calm you as well as them. Sometimes though, your presence may encourage a challenge - someone feeling braver or even protective of you. Just observe, and yes, it's difficult to discern sometimes, but you have video proof that S Mary just wanted to defend her personal space, not seek - find - and kill. Great signs!! Progress!! Keep posting - we can all learn through this experience. I'm glad you didn't give up. ;-D