What difficulty is "Kyle"?
"The Kyle difficulty level is the most difficult setting, and is based on one of the development team's AI Designers, who is apparently insanely good at the game."
Source: http://www.eventhubs.com/news/2013/oct/16/killer-instincts-training-mode-features-full-hitbox-displays-kyle-difficulty-setting-seamlessly-endless-recordplayback-function-and-more/
"The KI difficulties are listed as Noob, Easy, Medium, Hard, Killer, and something referred to as "Kyle."