Powers & Abilities Why did it take Luffy so long to create Gear 3?

#1
We saw Gum Gum Balloon as early as the confrontation with Buggy during the second arc in the series. But we didn't get Gear 3 for over 300 chapters later. Why did it take Luffy so long to create/unlock Gear 3?
 
#2
We saw Gum Gum Balloon as early as the confrontation with Buggy during the second arc in the series. But we didn't get Gear 3 for over 300 chapters later. Why did it take Luffy so long to create/unlock Gear 3?
Because one requires literally blowing air into your bones while the other one not?

Actual answer is because the Author decided to formally give Luffy a powerup at that point, not beforehand.

Not that deep.
 
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