That percentage in the Grimoire is a combination of the 2 yes but there's no way his percentage in PvE is so low it dropped his supposed 86 to a 20. Stop drinking the Koolaid
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http://destinytracker.com/destiny/crucible/ps/Troygamer11 Here's OP's profile on destiny tracker. His PvP percentage is 86.9.
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Wow I guess his PvE percentages must be in the negatives then lol