John Cappelletti
The Los Angeles Rams picked John Cappelletti in 1974. He brought home the Heisman Trophy when he was at Penn State. He spent ten seasons in the big leagues but lost one of those due to a groin injury. Not once did he achieve a thousand rushing yards in a single year. In 1976, he had his best season with a record of 177 carries for 688 rushing yards. He carried it 178 times for 588 yards the year after that.
Johnny Rodgers
The San Diego Chargers picked Johnny Rodgers in the first round of the 1973 NFL Draft. As you can imagine, they expected a lot from the Heisman Trophy winner. Sadly, he spurned their offer by instead playing for the Montreal Alouettes in the Canadian Football League. He was on the team for four years before debuting in the NFL. He only had one season because he decided to resign after a knee injury.