In 2019 Brandon Allen started three games for the Broncos. The Broncos won one of those - against the Browns by a score of 24-19. The 2019 Browns finished the season 6-10.
In 2020 Brett Rypien started one game for the Broncos. It was against the Jets and the Broncos won the game 37-28. The Jets finished that season 2-14.
Over the last three seasons when the Broncos have had to start the backup QB, the team is 2-7. This does not count the final five games in 2019 when Drew Lock started, since he was the starting QB at that point and not the backup.