Siemian again handily beat out Lynch last summer, but the Broncos would cycle through their trio of homegrown QBs during a 5-11 season that almost cost rookie head coach Vance Joseph his job.
In 2017, Keenum went 11-3 as a starter for the Vikings and finished the season throwing for 3,547 passing yards, 22 touchdowns and seven interceptions.
Kubiak is now Denver's senior personnel advisor and Joseph is the team's head coach.
Broncos quarterback John Elway has talked repeatedly during the offseason about the need to get better at quarterback. Surprisingly, it wasn't Kirk Cousins.
The Broncos had three quarterbacks start games this past season - Trevor Siemian, Paxton Lynch and Brock Osweiler - but it was a bumpy ride on offense as the Broncos were among the league leaders in turnovers and offensive coordinator Mike McCoy was sacked in November.
This is part of the reason the Broncos believe Keenum is a better fit. While Cousins is a very talented quarterback, not even Peyton Manning and all of his future Hall of Fame glory commanded that much when he signed with the Broncos back in 2012.
Kubiak gave Keenum his start in the National Football League, signing him to the Houston Texans' practice squad after he went undrafted in 2012. Their inconsistent play on both the offensive line and at quarterback have been big reasons why they've sat out the postseason.
"I still think we're not too far away, " Elway said. That doesn't all go on the players. "But I feel like we can get right back in the thick of things pretty quickly".