Keenum, who finished the year with 18 touchdowns, 15 interceptions, 3,890 yards and a 62.3 percent completion percentage, doesn't shoulder all of the blame for the offense's struggles.

Injuries ravaged the offense late in the year as the team lost Emmanuel Sanders and Phillip Lindsay to injury. Earlier in the season, tight ends Jake Butt and Jeff Heuerman both suffered season-ending injuries. And then there's the offensive line, which featured only two of the team's initial starters in their original positions when the Broncos trotted out for Week 17. Matt Paradis and Ron Leary were both knocked out for the year — as was reserve lineman Max Garcia.

A healthier offense and a number of other systematic tweaks could help lead to success in 2019, though.

"It comes down to giving also the best opportunity to be successful," President of Football Operations/General Manager John Elway said Monday. "I think offensively, we got decimated with injuries, especially late. We lost Emmanuel, that hurt, Heuerman hurt. Those types of things hurt you, but that can't be an excuse. We still have to figure out ways to get the job done. We're excited about the young guys that we do have in Courtland [Sutton] and [DaeSean] Hamilton. Tim Patrick has played well. They're young guys and they're going to continue to get better and better. We just have to continue to try to hunt and find the right combination on the offensive side with players as well as coaches."

Elway, meanwhile, will continue to do his due diligence to ensure the Broncos have the best possible option at quarterback.