In monsters they showed a character that was placed in the one piece universe that confirmed it's past to make monsters story partially canon to one piece.
but not only that it also foreshadowed a scenario with a dragon getting decapitated by a swordsman midair
so is it possible that the monsters one shot would foreshadow scenes like Ryuma defeating Cryano or D.R. or a pirate with magic based devil fruit abilities or natural sorcery powers or what about a true depiction of a literal almighty god hell what if the entire final arc of one piece itself is foreshadowed by the entire wanted one shots. some of the characters have appeared in bounty posters sure it could be just easter eggs but when it comes to foreshadowing us hardcore one piece fans are always watching out for oda