Halo 5 : "Industry sources support our belief that Halo 5 digital sales were much closer to half of units than the 20-25% GameStop is suggesting."

[Snoopy]

Protendo said:

I don't think anyone expects 50%.

There is no way that the normal high of 20% increased that much. That'd have to be a new digital AAA attach ratio record, and Microsoft would made sure we all knew just how hight the attach ratio was.

Microsoft did say this was the best selling game for xbox store during opening week.