Every single month since release day PS4 has out sold Xbox one world wide. Im sure there are a few reasons for this but it is crystal clear the kinect is the main problem in regard for the loss of xbox one sales. One, kinect makes the xbox one to pricey. Two, PS4 gives people bigger better games for less, since the kinect drains 10% of the xbox ones total gaming power away even if the kinect is unplugged, games are not as good as they could be. Three, most people spending the money on the new consoles just don't care about kinect enough to buy it, or xbox one would be selling better.
How does this happen? Simple, easy, there are flaws in the procces. You rely on bias studys done over xbox rewards. that guess what! almost all of the members there are only using xbox rewards because they don't work(puts them in a 14-younger age group). There is also information from the xbox forums you take for consideration. ya know, there is another reward program for the forums, that lures in the same group of people that make up the majority of both the xbox rewards site and the community forums reward program. This is leading you at MS to read information that is misleading and cheap when compaired to rest of the world.
Don't take this as a negative field, its the way I view things and should be helpful to you if you see it.
P.S. I'm a G for life.