because they werent there to fight every single opponent and beat them, they wanted to avoid fighting as much as possible and Apoo's DF was troublesome ...and it wasnt only Luffy and Zoro, it was Kid and Killer too, all 4 of them...if your logic of easy or not easy were applied then are you saying even for all 4 of them Apoo wasn't easy ? ... you can clearly said the logic is flawed and it was not easy but too easy if it truly was all out 4 VS Apoo