Big meme said that she needed the giants to be able to defeat the other yonko...
Crydo needed an army of fodder smile users to create a massive war and ally with Big Meme to take the ancient weapons and go for the one piece...
To attack WB, crydo needed WB to go face the navy to make a sneak attack rolf
Crydo put Shanks in the same league as Rocks, Roger, WB and Oden. And Oden very tired almost two shoted crydo...
So Shanks probably scared the shit out of crydo and being a reasonable man that's why crydo returned to wano unharmed
Crydo needed an army of fodder smile users to create a massive war and ally with Big Meme to take the ancient weapons and go for the one piece...
To attack WB, crydo needed WB to go face the navy to make a sneak attack rolf
Crydo put Shanks in the same league as Rocks, Roger, WB and Oden. And Oden very tired almost two shoted crydo...
So Shanks probably scared the shit out of crydo and being a reasonable man that's why crydo returned to wano unharmed
There's no excuse for that.