Part of me agrees with you but then again the secrecy surrounding this man is being managed tightly, and continuously. Has to be. Zippy has a mafia of his own. This mafia consists of marginally criminal people who are willing to do whatever needs to be done and who are being paid very handsomely for their activities and their silence.
Making someone’s past disappear and making it stay that way takes time, money and effort. Zippy is indeed a nitwit but he is dangerous nitwit.