We were briefly at Jaha together. I have Edmund Pevensie from there. I am going to throw him at Grant and probably at your others because I enjoyed the bit they talked there.
Ed remembers a Sydney, too, but not yours, and they didn't really know each other. I don't know a lot about her or Tenel Ka, but I'd like to get to know them!
And I stopped watching AoS at the beginning of season 3, but I've fairly spoiled.