He said it was pointless to smash them since they'd come back and eating was the way to stop them from coming back. We saw G4 smash through the biscuits. Regardless you all seem to be missing the point, the guy said "So Luffy can't beat Cracker without Nami" We don't know that to be true. He could still beat him with a different ally. Croc out strengthed him as well but once Luffy learned his weakness it was game over, why would Cracker(who has the same weakness) be different?Luffy was running....striking....eating repeat.
Went G4...striked...recovering with the help of Nami.He said this chapter he had nothing to smash through biscuits.