I Believe he should be due to the fact that he's most likely going to be the 2nd to the last Villain and he's obviously not just going to lose to Luffy in a 1v1. One more thing Luffy is going to need someone else help to even contend with Kaido's crew simply because Zoro is the next strongest by a wide margin and Sanji is most likely not going to be coming back anytime soon.