Kaido also never mentioned Gaban, Rayleigh, Big Mom (although she was right next to him when he said it), Garp, etc.
I think that spread with the 5 top/god tiers was really just about people he had personally fought and seen as great, respectable people both in terms of reputation and prowess.
Half those characters are frauds anyway, but that's not my point entirely. He has Kaido hype up Shanks and also has Kaido talk about how the nobles of the world don't really know war,meaning Garling didn't impress him at GV. and its pretty much consistent with others at GV too
Sengoku:Only hypes up Roger, Garp and Rocks at GV, doesn't mention Garling
Roger: only hypes up Garp and Sengoku
WB: Only hypes up Roger, Garp and Sengoku
So again, unless this guy has some great achievement, I don't see how I'm wrong. and btw, Shamrock doesn't even have a god valley, I don't think there's any reason to think this guy has fought anyone noteworthy in his life lol