Jaina and Kael'thas were old friends from Dalaran - now that Jaina has arguably surpassed even Kael'thas, what do you think would happen if the two of them met in the Shadowlands, would Jaina easily defeat him in a real fight? Would they still be friendly to each other - there might be considerable tension because of the faction conflict, Kael'thas being attached to the blood elves, especially after what Jaina did to them - but it's possible Kael'thas still has feelings for Jaina deep down inside, and it must be admitted, he acknowledges the void elves as his kin as well.
And regarding the three Windrunner sisters - Alleria, Sylvanas and Vereesa - how do they regard Kael'thas, their former prince and last royal ruler? I think Alleria and Sylvanas could perhaps sympathize with Kael'thas - Alleria was friends with Lothraxion despite all the atrocities he committed for the Legion, and probably understands the lure of good intentions while struggling against the temptations of darker powers; she also understands his attachment to humans and trying to avoid being isolationist, by engaging with other cultures and being part of the world beyond Quel'Thalas. Sylvanas, whom Kael'thas also loved and who rejected him in life, might also recognize in him a somewhat kindred spirit, one who was betrayed by his allies, rejected by the humans, and who has suffered tremendously while trying to protect the people they love - their people, in fact. Vereesa, I'm not sure...she married Rhonin, who probably knew Kael'thas from their time in Dalaran, but other than falling in love with a human mage who studied in the city, there seems no direct connection or commonality.
How do you think Jaina and the Windrunners would view Kael'thas - positively or negatively, as an ally or an enemy, or neither?