Are there many Heisman Trophy winners who were not quarterbacks or running backs?
Very few. The most recent was Charles Woodson for Michigan in 1997. He played both ways as a DB/WR and returned kicks, but played the majority of his downs as a DB. The full list can be found at the link below. It’s very sparse for non running backs or quarterbacks. http://www.nationalchamps.net/NCAA/heisman/heisman_trophy_winners.