Yep yep but sadly Kul Tiras moved during the Cataclysm. Some say that it moved where Vash'jir is but as you could see, no Kul Tiras there. Maybe it's gone southern
And my point with the fact that Kul Tiras isn't relevant in Legion is because Legion is about EVERYBODY trying to work Hand in Hand together to fight the Legion.
Sylvannas is not fighting Greymane, she's just defending herself because he can't assume his son's death.
I've rolled many worgens, and every time that scene between Genn and his son happens, I think the same : Dude, if you let your son lead another front, he may not be dead. But Genn wanted his son to be close to him.
And it WAS war, Sylvannas was told to take over Gilneas.
When the scourge attacked, she fought for Lordaeron (even if she was a High Elf), she died for Lordaeron, and where were Gilneas' Army? Behind walls.
Genn has nothing to cry for, nothing to ask for, he represents a coward Nation and he acted cowardly when Forsakens attacked Gilneas.
The conflict between him and Sylvannas is not leading the expansion somewhere, its only purpose is to build these characters' arc.
It's lower ranking.
The factions conflict in MoP had an interest since Pandaria was haunted by Shas, and the fights between Alliance and Hord unleashed them. The intro cinematic is an obvious hint. But Legion? We have no time and energy to waste in factions war. Genn Greymane is angry, that's ok, but Sylvannas seems more leading the Hord in the Broken Isles (and she has interests with the Valkyrs).
And Anduin will have a big story, I think that the Wolf cub will have to deal with the Bloody Pack (Worgens) and show some guts to manage the Alliance forces into the right direction (survival of Azeroth instead of personnal revenge).
I really don't know about the Vrykul raid, these ones are Odyn's followers, they did not reject the Keepers (since Odyn is one). It's just a tribe, one of many.
Nighthold's events end with Gul'Dan defeated and killed, he wasn't opening a portal there, he was using the Nightwell to summon Sargeras' soul into Illidan's body.
Since they can't do that, they'll need to find how to reach the Avatar of Sargeras and bring it back to Argus, so Sargeras could have a powerful vessel.