Move never heard anyone else say that the XT2 AF is better than that of the Nikon D5. It's not just about speed... accuracy matters. 11 frames per second sounds great until you realized only 2 or 3 are actually in "acceptable focus" in my own tests which are maybe 6 months out of date now.
Not sure what you tested then but my keeper rate is much higher. Also of course depends on the lens one uses
Also there are many other things to AF capabilities like number of AF points and that in case of the XT2 these cover almost the complete frame. Which in turn allows a total different shooting compared to the D5 for example.
This is not a comparison with the D5 by any means but the fact that mirrorless as the XT2 is on par for almost any task with most modern high end DSLRs - again of course you always need to know what you are doing and how you configure and use a camera. Just testing for a few hours will not do any longer IMHO.
Needless to mention that I meanwhile prefer mirrorless (especially the XT2) highly to cameras like D5 etc. So I really hope that a potential cooperation or fusion of Nikon and Fuji would be highly dominated by Fuji - or maybe better not happen at all, as I do not see what the Fuji X system as well as the GFX system could benefit form Nikon.
Times are changing and they are changing quickly - unfortunately for some sleeping giants.