Author and Ditko scholar Blake Bell writes that it was Ditko who noted the similarities to the Fly

Lee gave Ditko the premise of a teenager bitten by a spider and developing powers, a premise Ditko would expand upon to the point he became what Bell describes as "the first work for hire artist of his generation to create and control the narrative arc of his series".Lee, while claiming credit for the initial idea, has acknowledged Ditko's role, stating, "If Steve wants to be called co-creator, I think he deserves [it]".
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Author and Ditko scholar Blake Bell writes that it was Ditko who noted the similarities to the Fly.One of the first things I did was to work up a costume. A vital, visual part of the character. I had to know how he looked ... before I did any breakdowns. For example: A clinging power so he wouldn't have hard shoes or boots, a hidden wrist-shooter versus a web gun and holster, etc.