That's way ironic. Jack Kirby wasn't all that wild about Steranko, who came to Marvel and immediately got writing credit and more leeway (something that Kirby wanted). Darn upstarts come in and take over.. grumble. So I doubt Kirby based Scott Free on him.
Steranko did base his interpreation of Nick Fury on himself; in fact, I think one collage had a photo of Steranko AS Fury, which was pretty bold.