User blog comment:Xilinoc/Ch. 566 (not out yet, but dis gon b gud)/@comment-117598-20140129213100

As much as "The Understanding" sounds the most reasonable, based on his quotes of observation, I was also thinking about his confidence in defeating his target after observation. Maybe his letter means "The Undefeated" and Nanana's powers stem from creating all the proper counter measures to defeat a target after observing them. The longer he observes, the more certain his power will overcome his target. And it could work through a subconscious and instinctual level, meaning by simply watching, his power will automatically take effect even if the target doesn't do anything. Similar to how comic book power copying characters can sometimes generate new powers just by being around someone and not actually see the power. They simply stand near, begin manifesting the power and the knowledge to use them.

Pure speculation.