I've been wondering. Like yeah, Luffy payed respects to Ace & Whitebeard who died in the war prior to time-skip but it wasn't directly to an statue or shrine of some sort ya know? Just a crack in the ground....
So what are your thoughts that in the future this happens? :
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Luffy does enjoy exploring and maybe he'll decide to make a quick stop and pay his respects with his crew before or after meeting with the rest of the Whitebeard Pirates remnants.