Another possibility is that after being in the Maw for so long, will leave Anduin unable to fill his leadership position, requiring Turalyon and Genn to remain as Regents while he recovers
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How they left the Warcraft II era Alliance may factor in, Turalyon bravely risked his life to prevent an Orcish invasion of another world, while Genn left because he just didn't want to pay for the internment camps