Was Gear 5 planned since Chapter One of One Piece?

Oda is a master of foreshadowing. But was Gear 5 planned since Chapter One of One Piece? Or a random power-up as some fans believe?

One Piece Shows How Wild Gear Fifth Can Be

One Piece Final Villain is So Devastatingly Strong Luffy Gear 5 Can't Beat it - Enter Gear 6? - FandomWire

Here is an Official First Look at Luffy's Gear 5 in One Piece Anime

Was Gear 5 planned since Chapter One of One Piece?

How close is One Piece to being finished? What anime/manga will take eventually take over One Piece as number one? - Quora

Luffy's Gear 5: The Hito Hito No Mi Model: Nika - TFword.

What Episode Does Luffy Use Gear 5 in One Piece Anime?

Luffy Gear 5 figure: Release dates, prices, where to buy

One Piece Chapter 1095: Luffy's Gear 5 vs Saturn continues; Everything we know so far

One Piece: Why don't the Gear 5 episodes have Opening 25? - Dexerto

One Piece: Pirate Warriors 4 reveals new DLC characters