He never got the chance to go all out on Gladius to begin with. Only a close minded dude can't see it
I agree with the fact that he wasn't going all out against Gladius but that doesn't mean that he's stronger than him. He was totally on defence which means that Gladius is strong enough to get easily beaten by Cavendish. Even Gladius didn't go all out yet he was holding his own against both Cavendish as well as Bartho. Everything that happened during their battle just proves that they are on the same table. I said Cavendish was a little stronger because he has better portrayal than Gladius.