I don't know about any IFL, but let me give my opinion on Kelly vs Marino.
I think Marino was the best pure passer ever to play the game. I think Kelly had more ability to lead and inspire his teammates. I know that's a terribly subjective assessment, but that's my opinion. I also thought that Marino's talent carried a fatal flaw. No matter how much Miami wanted to develop a running game to complement Marino's passing, it was always too tempting when push came to shove to go back to relying on Marino's arm. It was that lack of a solid running game that kept Miami from making a serious run at the SB, and it was Marino's arm that ultimately caused Miami's ability to develop a running game. Again, that's only my honest, no smack opinion.