Worth noting that Fifa only comes in the official bundle on PS4, but came unofficially with almost every single Xbox sold. I Believe both actually count with GFK unlike NPD. Looking around people I know, Fifa is the game lots sell after buying a new Xbox. So I suspect it inflates the sales more than the player base to some degree.
I think somewhere soon, and probably not Microsoft, we will find out that although sales of the console have grown lately, I bet the attach rate for games bought is rapidly sinking as people embrace the game pass subscription model instead.