Until they give a "better" reason, I am going to assume the one they hinted at is true, and Microsoft just decided that it was worthless because it wasn't "Mikami's studio" anymore. Honestly, I already suspected it.

In which case, fuck them. These games were not made by one person, a studio is bigger than its director. And the rest of them didn't get even one chance to prove themselves.

Truly shows how little they value the people who make their games.