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Also, it doesn't really explain WHY it happens. Apparently, when Luffy's legs get compressed, he gets a burst of strength. But how come? What does compressing legs have to do with power? It's not been explained.
Anyway, Luffy learned to do it sometime between facing Aoi, and getting to Enies Lobby, and Oda didn't show it. So unless Oda planned to flashback to a scene like this, he probably wasn't gonna bother.
Exactly. Luffy decided to become stronger and learn Gear when he lost to Ao Kiji. Luffy was unconcious for about 3 days or more and then they headed off to Water Seven. The time that it took from the face off against Ao Kiji and sailing to Water Seven is at most a week so I'm pretty sure that the current setting and the time gap is not wide enough for them to do a detour and head to a Mecha Island. It makes no sense.