@Salah WG do you think Road is being used by Oda as a micro version of the Elbaf God of Fate of your theories, the one who's been helping Luffy from afar and the one who might also be the origin of Dragon's "wind"?
Indeed, i believe any Author before They wanna introduce something that Impactful, They must first insert the idea in their Reader's Minds, prepare you for it, just look at these first Three Chapters, They had very simple explanation but a lot of Ideas were suggested
What if We were turned into Giants?
RPG? (Role-Playing Game)
Nami's Intentional Lightning Attack is seen as a Natural Disaster in a Story?
Is this an Illusion? Are We Dreaming?
My Room/Temple?
Pretending to be a God
... etc
Oda did this before you know,
First Arc Blackbeard was mentioned, He made Sanji say "Do you know about People who don't Sleep?",
Not just that, He went even further and Introduced us to Chessmarimo, Two Characters as if They are One (Famous Theory of BB being Three),
First Arc Kaidou was Introduced, Oda first showed us Bobby Funk who had an Unusual Naturally Durable Body,
... etc
Dorry & Brogy already confirmed in Little Garden that They believe their Ruler decides their Fate, so Road is clearly a Mini-Version of a major upcoming revelation, especially when Oda added those Snake & Crow who are Mini-Version of the real deal.
Also look at what SHs did, Oda didn't make them try to leave from the Front Door or just face Road in his Room, after They crossed the road & reached "Temple" of Sun God that People warned about, They decided to go back in & make a second Journey & leave from other side
This reminds us of Roger's Journey, who crossed entire Grand Line to find Lodestar Island & then decided to go back & make a Second Journey to find Laugh Tale, a Place that no one would realize exists on their own unless They actually made it to Lodestar first
Oda even called this Adventure In Land of Mystery, not Land of Giants, a Name that applies on entire OPVerse, not just Island of Giants, so these first Chapters aren't just a Teaser for Giants Story, it's a Teaser for entire World & it's Mysteries
Blackbeard Pirates are only ones who keep confirming over & over again that everything is Fated, They don't actually decide their own Story, go check their Dialogues, mostly in Pre-TS, They strongly believe in Higher Power (So does Dragon & Mihawk)