Although Nomura may've conceived the characters of Shadow and Setzer, Amano was the person who actually drew the character designs. I'm not arguing that he had a part in thinking up the characters, but he never did any of the artwork of them, so I don't understand why people will occasionally bring that up.

On the converse side, Amano did not actually do character designs for FFVII, VIII, X, and other games where Nomura was the character designer. He drew concept artwork, as he did for most of the other main-numbered games where he wasn't the character designer.