It's not his territory and i don't think so otherwise he has all now. The last RP is a mystery.
It’s not he said he doesn’t have it
Last Poneglyph is probably WBs treasure that Weevils Mom and Marco mention
The giants and Saul went to Ohara and gathered all the books there, so they are going after Void Century knowledge.
Kid clearly considered Saul (the burnt man) to be a big advantage in the race for PK for some reason.
I think there’s a pretty good chance they picked up the FI Poneglyph for safe keeping and it’s on Elbaf. That way Luffy will have 3, Shanks will have 3 and Blackbeard will have 3 (assuming he lifted one from BM while his crew was on WCI, it being really dumb for them not to have done it).
I don’t remember Shanks ever saying he doesn’t have a RP. And it seems Elbaf is basically Shanks territory, since he can drink there, gather his crew there, is friends with the legendary Dorry and Broggy and has annihilated Kid for trying to start a fight there.