User blog comment:CalienteSnaidero/KF's Secret?/@comment-167456-20110522160709

SPOILERS

I don't think he has a secret (besides the other revelation in the free book that he knows Robin's secret identity). My impression was more that he was being made to feel insecure. He's worried everyone will realise that he's not good enough, fast enough, controlled enough, etc etc. Then he realises, wait, yes I am. Crisis over. (Although it's telling that the reason he thinks he got over the fear effect faster is because of heightened metabolism and not because he's better adjusted than the others - still some issues there, maybe.)

END SPOILERS