Smartest: Accardo, Gambino, Costello, Joe Bonnano, and have to go Lucky as my last
Dumbest: John Gotti, Gaspipe (not sure if he counts, but certainly fits the dumb bill), Joey Massino, Carmine Persico, and I hate to use another Gotti but Pete Gotti. I believe he was legitimately mentally deficient.
Another set of good choices. IMO, the 5 you listed as the smartest gotta be in the running. And the 5 you picked as the dumbest also fit the bill nicely.
