Im thinking that a lot of the games deaths wouldn't have happened.
Carley obviously, maybe Duck and Katjaa since without Lilly Ben might have had the guts to confess earlier. From there who knows. Would the extra eyes (especially Carley) have saved Lee from his bite or stopped Clem being kidnapped in the first place? Could they have kept the boat? Impossible to say for sure but its a real possibility.
Duck may have cause problems later on though without a safe place like the motor in for his "enthusiasm" Not to mention you'd certainly be struggling for boat space. I'm imagining between 6 and 8 survivors for 5 places.
BFF's: Lee, Clem, Carley and Kenny
Although the forever in BFF should be taken loosely