it's a calculation from SE, most third parties are probably aware that MS is willing to pay a lot of money to compensate for their lack of proper studios... they cannot differenciate by offering better exclusives, so they have that.
My guess is they paid quite a lot to have exclusivity on a well known IP like this one (obvisouly it's not COD or Battlefield) ...
I find this morally dubious, but I get why business people do this, it takes the risk out of the development phase for the publisher and the platform holder gets something to parade their console with (but what if the project gets delayed? penalties?)







