If Andy Russo was a bigger mob figure than Crea or Cefalu he would be on the street making money and not in jail.
The Colombo's are easily the weakest of the Five, while Crea and Cefalu run their families silently and efficently.
This day and age, you can't be "big" and run a Family, that's not how it works anymore.
And where did you hear that Godfather bull?