Just mentioned how they present a playability problem.
Strip away the bandages from Ethereals, they look a lot more like elves than Brokers, even if the kin-ship have been confirmed (??).
Broken (Nagrand/Shadowmoon Valley in TBC) doesn't look like Draenei in game. I don't see them share a skeleton.
Does this look like an elf to you?
Broken from Outland use the old Tauren skeleton. They're irrelevant. The Krokul are the ones you should be looking for.
Before Kael'thas joined Illidan in Outland, Vashj approached him, suggesting to help him with the undead that Garithos tasked him. She pointed out their common ancestry and their hunger for magic. He accepted her offer. Later on, she took Kael'thas to Outland with her to join Illidan.Pretty sure they allied with Kael'thas and Illidan ONLY.. Not with Blood or Night elves as a whole..
Or more correctly, Illidan allied himself with Kael'thas (and the Blood Elves) and Lady Vashj (and the Naga), by giving them the vials. It wasn't (as I understood it) an alliance between Blood Elves and Naga in any way, but like "the enemy of my enemy is my friend" type of situation.