4. Seattle Seahawks – Stan Gelbaugh
There are a lot of players who played in the (now defunct) World League of American Football, and came back to the NFL and made a successful career. Stan Gelbaugh was not one of them. The former London Monarchs quarterback was named the Offensive MVP of the WLAF.
But after coming to the NFL, he spent his last four seasons in Seattle, throwing only seven touchdowns — compared to 12 interceptions — in four seasons. In fairness, he only started nine games in Seattle, riding the pine for most of his time there.