What is deeply involved @patrickklepek ? Sending a single engineer to Crystal Dyamics over to make sure the game reaches the much fabled 1080p? Sending a batch of sandwiches in crunch time? You're giving too much credit to Microsoft on publishing a game. That's not deeply involved but par for course on any type of exclusive publishing deals.
Publishing is actually much more than we usually realize. Publisher for example provide testing resources, localization, take care of certification process and other stuff. And there's obviously the whole marketing side which is also a big deal. Publishers manage if different portions of the game are developed by different teams, like outsourcing multiplayer to a different developer and so on.