There could be a ton of reasons for console (timed) exclusive...
How about...
Tomb Raider development was behind schedule but they wanted to ship during holiday 2015. By partnering with MS, getting their marketing dollars, and by parking other versions they gained the resources necessary to finish Tomb Raider on time.
Oh... Sorry, that would just be logical, and would not involve a large conspiracy or a reason to blame MS for this apparent sin.







