Ahmed; Suppose that both Fred and I are Gs. You remember what happened last night? Fred was going to get lynched with five votes before I jumped to change the people' votes to Jasper. If Fred and I are both gangsters, Fred was already going to be saved with what I did so why did Fred state that he is the bodyguard? What was the need for it? He could have saved this trick for the next days. No way are both Fred and I gangsters.
Now, with what Fred claims (that he is the bodyguard), the REAL bodyguard must come and claim otherwise. But it hasn't happened yet. Fred is the bodyguard and we have to trust him.
Bisco and Blondu are sure bets. They are both Gs.