He is looking at Drake and Zoro as they chase Apoo and according to bounty posters he saw which one Zoro is.
He says 2nd and 3rd strongest before he even mentions Sanji.
However, Sanji is not top 3 in any way except the bounties but in that case Zoro isnt counted, which he is.
You said he saw him standing with the SH crew so he knows.
Queen says Drake is 2nd strongest and Zoro 3rd strongest, he listed Drake first.
I am not saying who is stronger than who in my opinion, I am saying what Queen is saying.
My opinion is that Queen is wrong because Zoro is the strongest among all alliance fighters.