I'm also having the hardest time ranking Otto Graham. His influence and impact on the game was undeniable - he was as tough as they come given the era he played in, he was a freaking dual threat, too.
He played running back in Highschool or some shit, and when you watch the fee clips we have of him, you can see his scrambling abilities on full display. In terms of arm talent, he was known to be the most accurate passer up to his time, and even a good time afterwards. It was stated, his teammates once bent some metal hangers into the shape of an circle, placed them 10 yards away and told Otto to throw it threw them. He threw 10 balls through the hole perfectly - I mean, that's literally insane Drew Brees-like accuracy.
But his cons was....well, he played in a era that barely allowed blacks and the athletes were just vastly inferior as a whole. Hence, the conundrum on where to rank him.