The most interesting thing was Zoro holding back in his fight.
It was told here that he might be holding back because he doesn't want to hurt Monet, or because he doesn't want to unleash his power. This is not impossible, however it's strange that he doesn't at least try to fight back harder, as Monet is not only a threat to him but even to his crewmates.
In fact the other option, that is Zoro doesn't have CoA Haki yet/cannot control it/has it but undeveloped, would mean to me that not even Sanji hat is yet. I haven't followed the discussions on chapters before, but Sanji got hurt against Vergo some chapters ago and this could mean he couldn't strengthen his leg enough(even though it could just be because of his precedent physical damage).
At this point it could even be that Luffy said a bunch of crap to Law regarding who's haki and who has not XD.