In chapter 935, Oda drew the young days of Grandpa Hyogoro. Twenty years ago, he was the most famous yakuza boss in Wano.
Hyogoro looks like a famous Fudo Myouou statue (Wisdom King/明王).
In chapter 921, Kaido was said to be the same “Wisdom King” who protects Wano Country. It is known that Yakuza people love Wisdom King tattooo.
Maybe Oda wants to hint us that Grandpa Hyogoro will take the position of Kaido and protect Wano peacefully with Momonosuke after Kaido gets defeated…