By sandman
Thank you so much for the spoilers, redon!
Someone asked me via PM about Robin's line that Sanji is the "two wings of the Pirate King". The Japanese term 両翼 is commonly used to describe 2 crucial persons/things.
I've never seen the case where 両翼 is used to describe only one person in my life, so it's safe to assume that Robin meant Sanii and "another person" being important for PK
And Oda already used the exact same word 両翼 in SBS,
saying both Zoro and Sanji are two wings for Luffy :)