>>142823777because he's already known to handle secret agent stuff as a PI working multiple angles, he's been a teenager before, and his little brother is rogue with KND knowledge too. Perhaps most importantly though, is no one would think he could do it. Numbuh 1 is GKND, number 3 would wistfully accept it before waving good bye to all her friends as a mask, and numbuh 5 is going to be kept on. Numbuh 4 is the one everyone thinks won't go down without a fight, and he'll make sure he gets one last fight against the entire KND to make sure they're ready for life without him. Numbuh 2 though, they'll think even if he wants to resist will be easy. Only the higher ups will be expecting a struggle, but even then when he's outgunned and back against a corner, numbuh 5 will pull something to let him sneak away because she'll need a man on the inside so to speak.