From This Week at Bungie - 8/9/2018: "As a final note on Power, we’ve heard a lot of feedback concerning Exotics. To make these rewards feel more useful, whenever you receive an Exotic reward in Forsaken, it will always be at or above your Guardian’s Power." Well, this is proven to be false when you use a Boon which rewards an Exotic at the end of the activity. I was 583 on my Titan, and my Exotic reward was An Insurmountable Skullfort that dropped at 380.