Moria was far more powerful in the past than during Thriller Bark and Marineford arcs. Besides most samurais are not really that strong, only a handful of them are really as powerful as they are rumored to be.
So Orochi was already in league with Kaido even though the Beast Pirates weren't present in Wano. After Oden's return and defeat Kaido must have thought that it was better to remain in Wano to make sure Orochi stays in power.
Orochi may have contacted him and told him about the RP and the Kozuki clan's relation with the Void Century after he realized that he couldn't take on Oden on his own.
Seeing Orochi's reaction upon seeing Oden and his vengeful reminds me of these old posts of persons who believed that Orochi was admiral lvl and truly defeated Oden in single combat. This make them even funnier now.
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