I didn't dispute Quel'thalas. I disputed the "the high elves" part as it was not all of them.
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If their prince serves the Alliance, then what does that say about their kingdom?
I am not talking about Anasterian withdrawing per se, but the way it doesn't make sense that their prince serves a human. After his father's death, he became the leader of his people and his kingdom, while serving Garithos.