Why? As long as it was done legit then no matter the raid it should count, and the trophy definitely proves it.
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Crota pre-390 was, by most players' standards, not really a raid. It could be solo-ed, flawless, start to finish. Usually by abusing poor mechanics and map design to cheese it. Even done legit it was never really that difficult. So while you're right, it's still a raid and done legit it still counts... Does it really count?
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Only if done legit with a 6 man team, yes. But solos or even 2 mans no.