You are making great progress with Gracie! From what I've seen, jealousy is a great motivater for greys. That could account for Kya's recent treatment of you. If there is one thing Timber has taught me, it's all about him all the time. He will speak when people in the room if he is being ignored (never otherwise), say "OK, Bye" when I'm on the phone and not talking to him, etc. etc. You probably seem much more interesting to Kya now that he has competition.
I hope getting out and about works for you. I've tried with Timber several times, and he remains terrified of the outdoors.