User blog comment:Roranoa Drake II/Episode 739 Review: A Sign of Good Things To Come/@comment-24850639-20160511145313/@comment-5398287-20160511191918

Honestly, I think their reactions were justified - Shanks is strong and fearsome and all, but Kaido is supposed to be THE strongest, THE greatest, THE most fearsome of pretty much all the big names in the world now that Whitebeard's gone. Plus, I don't know that they were planning to go after Shanks right then and there - for all we know, they planned to train and recruit some more before attacking a Yonko head-on - so suddenly being faced with not only someone far above their current level, but someone who's apparently pretty pissed too, would scare anyone with some common sense, even Kidd (meanwhile, the only person who scares Luffy is Garp).