There could be accounts abandoned after the first week of launch, but are counted as part of the 25 mil.
Hate to say it, but if you read about Halo's numbers there's no vagueness. It's all cut and clear.
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Halo just came out... of course the numbers are cut and dry, just like destinys' were when it first came out
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I'm not sure which numbers you mean. All I've ever heard about was registered users and average play time.