I thought this was pretty obvious though?
1 > 2 > 3 > 4 > 5 > 6 > etc.
Unless you failed kindergarten arithmetic then there's no reason why Sanji would be below 3 and above 3 since Sanji is literally number 3 itself.
"But but Jinbei and Yamato is stronger than Sanji....."
Yeah I also remember when Chopper, Robin, Franky, Brook are all stronger than Sanji. Good time.
"But but Sanji is the 5th to joined, Nami is more important than him because she's part of the Romance Dawn Trio along with Luffy and Zoro, etc."
Thanks for telling me that Usopp is more important than Robin who is the only person alive that can read Poneglyph. Nami is not more "important" than Sanji because she's the OG member. That's because she can established the full structure of the crew. You need a captain to lead and a navigator to handle the direction. Nothing more, nothing less.