Sanji isn't going to crack a billion this arc. The Strawhats aren't going to get Yonko level bounties (current Blackbeard's excepted, given they are also in line for a massive raise) until after Elbaf and meeting Shanks, so they can still go into that arc as the all important underdog. Here it's still an alliance, the Strawhats aren't taking the Yonko on solo. Kid and Law will get massive bounties, Zoro might just crack a billion- 1.02 billion being rather likely, which still doesn't put him above Katakuri, who probably has the lowest YC1 bounty.
EoS, anything around the 2 billion mark would more than likely put him far above his contemporaries and would be perfectly fine for him.