Lower stats from collections, mid stats from engrams, and high stats from rare sources... they need to be tiered like legendaries... let them drop up to 75 like a tier 5. Equipping an exotic at 63 can sometimes weaken a build if you a relying on quad 100's or penta 75's.
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Exotics could always drop higher than legendary. So I'd say T5 exotic could be up to 80