One piece doesn't have great foreshadowing. And oda isn't the goat

Majority of the foreshadowing in one piece is weak

1.SANJI CALLING HIMSELF MR PRINCE .

In pre alabasta arc sanji called himself Mr prince .when he was speaking with crocodile he answered call in place of Mr 3 so he called himself Mr prince.It was no fore shadowing sanji being prince of germa kingdom even if it was it's just a weak foreshadowing

2.ACES TATTOO

When ace was introduced in alabasta arc we saw a tattoo on his arm with asce with s crossed. At that point of time we knew ace and luffy were brother. We didn't knew about Sabo at that time . So we could interpret it as just spelling mistake since c and s kind of sound familiar. We didn't knew ace and Sabo had another brother sabo if we know he did and he isn't showing in current time line so it can mean 2 things

1. sabos dead or missing

2. He will be introduced later

In marine fort arc we learnt sabo is dead .If we knew ace and luffy had another brother . Then this would have been incredible foreshadowing

So this is also a example of weak fore shadowing

3.SKYPIA DANCE 🕺

when luffy unlocked gear5 his moments were similar to when he was in skypia arc it's just oda using reusing past past panels it's lack of creativity (week fore shadowing)

It's just because one piece fans invested so much time in story that they find some hidden strings connection in story even if the author didn't actually meant that(conisidence)

let's take a example from naruto when Asuma was near his death he told shikamaru would be a great hokage was he fore shadowing shikamaru being 8th hokage in boruto after 10 years .

The answer is no it was just a pure coincidence

For something with a 1100+ chapters there would be a lot of coincidence. Or callbacks using weak strings from past chapters