What connection does Kul'Tiras have with the next expansion? You're assuming as much as who you quoted. Least their assumptions is based on bigger things like an interview with one of the Game Developers aka Ion Hazzikostas who will be working on 8.0 as we speak, detailing that "Dragons will be important" at 112 including the current expansion: Legion filled with meetings of 6 different Dragonflight who we have interacted with across patches. Yours is on 5 datamined items on a PTR which is so subject to change it hurts and assuming (not confirmed in the last several months and patches) Jaina went there from the beginning of Legion.
Back to topic.
I couldn't really pick if I'm honest.