Though Flacco has won a Super Bowl and had a legendary stretch of outstanding play in that entire postseason, his play has generally been mediocre, or worse, since that winter. That hip injury in Week 9's matchup with the Steelers eventually led to Lamar Jackson getting the starting job and literally running away with it.
The trade won't be processed until the new NFL league year begins on March 13.
Update: Baltimore is reportedly sending a mid-round pick to Denver, according to NFL Network's Ian Rapoport.
The trade was a no-brainer for the Broncos, who have struggled mightily at the quarterback position since the retirement of Peyton Manning. Flacco signed a contract extension with Baltimore's cap-strapped front office in 2016, which added money to the deal and included a $40 million signing bonus for the veteran. Case Keenum finished the season ranked 21st in yards per game (243.1), 23rd in passing touchdowns (18), and tied for second in picks (15). Flacco went on to win a Super Bowl, as well as Super Bowl MVP honors in the 2012-13 season, while passing for 38,245 yards, 212 touchdowns and 136 interceptions in 163 career National Football League games.