I think Schooly's point still stands that even if it sold amazingly, that was mostly due to hype, a new company, awesome graphics, and Master Chief being back. Then people played it. Then the game dropped to 13th on the Xbox Live activity chart within a year of its launch, and is who knows where now. Meanwhile, even a game like Reach that came out in 2010 is still top 18, only having been bounced from the list once, and comparable AAA games (or lesser quality AAA games) have managed to hold their own and stay higher up on the chart (with many having their populations split between multiple similar games, like BF3 and BF4, or the endless CoD games that are everywhere).

Thus, although H4 might be the best selling allegedly, it doesn't back up that 9 million sales thing. Define best. Was it best selling because it sold a billion copies in its first month or two, or in its first 24 hours, blowing away previous Halo launches? I know you're being funny (I hope), but it's still a sad source, and still doesn't say anything about where H5 will be based on actual numbers and interest and care and people playing.