Rooster,
I read through your posts, and there a lot of similarities between your situation and what I went through with DAG. Even similar views on sex. I can do one night stands, but DAG needs an emotional connection to someone before he can have sex. Also, I went through a long period of not having a sex drive, which really negatively impacted our relationship and was one of the reasons DAG wanted to step outside of our relationship and explore a pleasure (kink).
As far as metas, it took forever for DAG to convince me that I needed his partner's phone numbers. I didn't want them because I didn't see a need to be connected to them. Only when he mentioned their use in an emergency did I get the point. Begrudgingly, I took the numbers and later regretted it. I was being sucked into their text conversations and wanted nothing to do with it. Which is why I now have a boundary about contact info.
It's good to know you found someone outside of your relationship to speak with (the gay colleague). There were things I refused to bring up with DAG, because I felt he had a bias towards Bruiser and Fisticuffs, but I felt free to talk to my other friends, as I felt they were honest brokers.
The one thing that hit home with me from your post is about your fear of KC loving someone more than she loves you. I think (I have no proof) this is the biggest reason why people have a hard time in adopting a poly lifestyle. I hate to say this, but you have no control over how she feels towards anybody. What gave me comfort was that DAG always came home. He never stayed overnight with either of his partners. He told me several times I am his one and only, and I accepted it as truth. That reinforcement helped me work through my jealousy and eventually realize that I was feeling envy more than jealousy. Now I see envy as a good emotion as it motivates me learn more about DAG, his dreams and wants.
Keep posting! It's great for processing all sorts of stuff and the people on this board have been very helpful and understanding.