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Oda didn't have everything planned out when doing the early chapters, so early instalment weirdness (like Shanks loosing an arm) is understandable.
But that does not mean he did not have broad strokes ready.
Haki seems like a no brainer to add with Logia's (possibly not planned at chapter 1, but definitely atleast on the works by Loque town).
Sabo might have been a later addition, though not going to swear on that.
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