"Cheyenne-chan"... [That narrows it down. In fact, Sanji has a hunch who it might be. He's never met the boy before, not properly, but it's hard to miss some of his extravagant voice recordings through the journals - most of them which Sanji doesn't approve of.
His tone is dry and brittle as a result] Some guy called Kida, right?
[Action]
His tone is dry and brittle as a result] Some guy called Kida, right?