Just as a point of reference.
"Right hand level" should mean > all YC2s (Dressrosa Luffy).
It's not an exact level. It just means no left hand is stronger than you. Luffy proved he was "right hand" a.k.a. > YC2 in Dressrosa, by being the first to break out of parasite. Marco for example was barely stronger than Jozu (Jozu had better feats at some points), and Luffy was stronger than him. He was essentially ~ Katakuri, but needed to surpass Katakuri, to be considered "5th Emperor".
"Fifth Emperor level" was Oda's way of saying > all YC1s (post-WCI/Wano Luffy). Again,
not an exact level. By beating Katakuri, he proved he was > YC1, a.k.a. Fifth Emperor. It's clear to anyone with a brain, by surpassing Katakuri, King and Marco and co. became irrelevant.
Luffy couldn't be considered if there was a commander stronger than him.
By beating Queen, will that make Sanji "right hand level"? Possibly, but Jozu > Queen is quite likely a strong possibility. So it could mean he's just as strong as Jozu, and Zoro as strong as Marco.