User blog comment:Guts!/Anime Depiction of Luffy's Gear Second/@comment-972068-20130528014001/@comment-972068-20130528202202

"he has now been shown capable of activating it by pumping blood in only one particular part of his body"

Why would Luffy EVER activate it in his entire body if he can do that with ease? Look at the cover of 628 again. It's not even a situation thing; it's showing their powers. Their new abilities! And yet Luffy has smoke all over his body.

Plus, there's a metaphor for stories; Chekhov's gun. ''If you say in the first chapter that there is a rifle hanging on the wall, in the second or third chapter it absolutely must go off. If it’s not going to be fired, it shouldn’t be hanging there.'' If Luffy can use Gear Second on one part of his body, he MUST keep doing it. If he's never going to do it, he shouldn't have done it in the first place.