R3 7* Warlock unduped or Red Skull duped

I have R5 6* Warlock.
Should I R3 7* duped Red Skull or unduped Warlock?
Can always use Tier 2 dust on 6* R5 Warlock?
Also have 7* Guardian duped, Prowler unduped, Shuri unduped and Shocker unduped
Should I R3 7* duped Red Skull or unduped Warlock?
Can always use Tier 2 dust on 6* R5 Warlock?
Also have 7* Guardian duped, Prowler unduped, Shuri unduped and Shocker unduped
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Comments
Take up warlock.