User blog comment:Benjamin Bredmose Hansen/Sanji ???/@comment-1595565-20111218003820

It's a running joke that no one knows what Sanji looks like. He wasn't on deck when they picked up Mr. 2 in Alabasta, so Crocodile didn't know who he was. And then Attach left the lens cap on so they had to rely on an artist's rendering. As a result, there was a case of mistaken identity with Duval and Ivanko v didn't believe he was a memeber of the Straw Hats. So it's a running joke that becomes relevant further down the plot.