Kidd has still 3 billion bounty worth, but he was one of those characters that deserved a humiliation.
Tho he's gonna come back stronger or with a plan.
So, Kidd and Law both lost to Shanks associated characters
Kidd lost to Shanks, who is VERY Shanks associated
Law lost to Blackbeard, the guy who scarred Shanks
Luffy's OG scar came from Shanks, because Shanks wouldn't let Luffy join the crew
Loki is strong AF, and nearly died from Shamrock one-tapping him
Luffy often fights people who don't really want to beat him
Even Linlin loves a lot of Luffy's crew, and was going to leave him alone after taking Sanji
Kaido straight up was training Luffy on the rooftop "Only Haki can transcend all"
Shamrock was clearly friends with Harald (Sommers: "Are you here to visit Harald's grave?"), and still nearly killed Loki, because Loki killed Harald
Oda has stated he's excited to draw a pirate with an eye-patch
I think Shamrock is going to low-diff Luffy and take his eye out, like Kidd and Law lost to Shanks and Teach.
Law and Kidd both lost their ships when they challenged a true Yonkou to a 1v1
Shamrock is clearly being portrayed as a Yonkou-level threat
I think Shamrock is going to come back to Elbaph and give Luffy the business (I also think serious Shanks could one-shot Egghead Luffy, there's a reason the Gorosei don't want nuffin)