Sam Darnold 8 Drew Lock 7 Jalen Milroe 1Drew LockSeattle Seahawks quarterback Drew Lock during minicamp at Virginia Mason Athletic Center. | IMAGN IMAGES via Reuters ConnectLock is the favorite to win the backup quarterback job mainly because he's the incumbent. Lock is a safe pick for the backup quarterback position, which is what you want in a backup quarterback. Jalen MilroeSeattle Seahawks quarterback Jalen Milroe during minicamp at Virginia Mason Athletic Center. The backup quarterback job won't be won on the practice field.