Sub - overlapping Vanish and Shadow Dance

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(Assume T18 4-set bonus, and Archi Trinket)

I know it's good to use Vanish just before Shadow Dance in the Sub opener (so Find Weakness is basically overlapped instead of being applied twice), but if Vanish and Shadow Dance come off cd together later in the fight, should I overlap Vanish -> Shadow Dance again? Or is it just for the opener only (if so why)?

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You can overlap them, Vanish in now more about the 30% damage increase than FW uptime.