Also I don't believe it was in Fredos intentions to become Don. I feel Roth misled him into thinking that if Michael was knocked out then he being Fredo and Roth could work together for years just as Roth and Vito had. Since its pretty apparent Fredo is trying to become like his father in the second one. I point out the conversation in Cuba between Michael and Fredo and the mustache Fredo has on in the beginning of GF II.