Quote Originally Posted by ReXDrake View Post
This quote is hidden because you are ignoring this member. Show Quote
read the above post. He didn't on at least 2 of 4 instances
Because Oda handwaved it. He had to blow air into his muscles and bones. It was a multi-step process Doffy watched.

Oda just decided to use the hand of god to handwave his own in-verse logic for G4 because of rule of cool and too lazy to draw a scenario where Luffy has to make himself time to transform. That is it.