It would have been better if you just screenshot the profiles when they had the gear active.
Also that build uses firebats as active skill for Mantle of Channeling.
Overall it's probably one of the more powerful variations with Zunimassa set. Especially as Zuni doesn't have a shoulder set piece itself. Your description is prety much the same, just swap Haunt > Firebats (Vampire Bats) to get both benefits from Mantle like Tony wrote in his build.
Maybe what you've seen are some rare snapshots from GR clears with that setup.
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