I saw the 1963 AFL Championship game on TV. Keith Lincoln was one of my favorite players in those days.
In the 1964 Bills-Chargers AFL title game, Lincoln was off to a hot start putting the Chargers ahead 7-0 on the first possession. Soon after, Lincoln caught a pass in the flat and Bills LB Mike Stratton hit him in the ribs knocking Lincoln out of the game. It was a legal hit.
Lincoln was slowed by injuries in 1965-66. He was traded to Buffalo in 1967, had a good year for a losing team, over 1100 yards rushing and receiving.
In 1968, the Bills went with younger players in a 1-12-1 season and traded Lincoln back to San Diego. He got injured again, ending his career.
Sis Gillman, Charger coach, compared Lincoln to Frank Gifford, a player who ran, caught, passed. Paul Hornung was another Lincoln was similar to. At his best, Keith Lincoln was faster and more athletic than Gifford and Hornung but had too many injuries.