Wings need to be equal otherwise the bird will fly of balance
And now the chapter after that oda has told us the other wing
See how black maria emphasizes on the "pair" part for robin and sanji, even though luffy's defeat also just got broadcasted recently
Now, some people may be unsure from this. Fortunately, our beloved Spanish translation has come to save the day.
In the spanish translation, black maria also referred to robin and sanji as pair (un par).
Also see when sanji first used sky walk to fly
The ones giving reaction are robin (the wing) and luffy (owner of the wings)
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