size was against him, as he didn't fit into any of the NFL's cookie cutter molds they want players to fit into.
That and he had a less then admirable reputation off the field. There was a case where him and a team mate in college actually held up a liquer store at gun point. Due to who he was, he was let off, and it was hushed up. He had the reputation of being a hot dog that didn't play by the rules and was above rules for mere mortals.... So based on all this, the NFL wasn't willing to risk the chance. After showing his abilities up north, the Chargers signed him, and he played 1-2 years, but with no real big results.
He was a phenominal (sp?) punt and kick returner, and would be one of those very elusive backs in the open field. Great reciever! Would think that with the faster pace, and larger field, he'd have been a real threat in the CFL.