jaina also refers to what she perceives as betrayal by the sunreavers as being betrayed by her ‘own kirin tor’ as well as crediting the sunreavers with being productive citizens for thousands of years and the ones who helped humans discover magic in that scenario. rommath and lorthemar acknowledge that aethas IS kirin tor. but the sunreavers consider the horde as their family? blood elves sure, but the horde their family?
this is your sides own invention. the neutral ‘high elves’ in dalaran all service the horde in the same capacity they do as the alliance minus any elf in greyfang enclave
we know they are free to revisit their homeland. if you played a hunter or mage in legion you saw ‘high elves’ and blood elves happily working together not missing a beat. esara verrinde and ravandwyr for mages and vereesa and halduron in the hunter campaign respectively. auric sunchasers last lore location is back in quel’thalas as well. vereesa herself even tried to joined the horde at one point
so did aethas sunreaver and liadrin. they all went in individual capacities. whats your point