By Jethro Nededog LOS ANGELES (TheWrap.com) – As if Jack Crawford (Laurence Fishburne) didn't already have enough to deal with on NBC's "Hannibal," a new addition is sure to make things more difficult for him. Cynthia Nixon is joining the second season in the recurring role of an FBI investigator, an individual with knowledge of the casting told TheWrap. She will play Kade Prurnell, who works in the Office of the Inspector General in FBI Oversight. She is charged with looking into the events that went down on Season 1 and Jack's role in them. …