this is just being stretched too far.
Zoro crushed a ladies skull, the resulting pain will make anyone weaker. Especially if its your brain thats getting damaged.
Roger have a DF or Haki? Why not both? Though I'd find it funny if Rodger had the same DF as Luffy.
Zoro hearing the enviroment, I just took it as a swords skill that he heard about from his master and just happened to learn how to apply it during his fight (Which he subquently hasn't shown since then, which I always ask why he has trouble cutting XX if he should be able to hear it and thus cut it). Yanno, being one with your surroundings, stuff like that. Besides it was implied that Zoro was able to beat everyone at that school (outside of the sensei's daughter) which is including the sensei, had the sensei knew and could apply haki, zoro wouldn't have been able to do that.
OMG new rumor, Senseis haki training is what killed his daughter.
Garp's love tap to luffy was obviously supposed to be a joke, including them both falling asleep at the same time. Maybe that sleep bubble from their mouth is the result of each others haki's canceling eachother out "rolleyes".