There are still Vex on Nessus, Io, and Mercury too. Wouldn't you think they would be gone as well? That would really screw up the content on those planets.
Nobody ever accused Bungie of telling a great "STORY" with Destiny or Destiny 2. Hell, it will probably be a couple more years before we hear anything more about the black pyramid ships.
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Well here's the thing Mercury and Nessus are still vex controlled world's, so even without their leading minds they still dominant The vex on Io took a beating true, but that only means the conversion process has near halted The moon never had Vex on it, as a result they shouldn't be there
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<The Undying Mind and the Sol Divisive had no effect on the rest of the Vex in Sol, who considered them outcasts.>