If Bridgewater does indeed beat out an incumbent starter (edit: Lock) who the Broncos spent a second-round pick on in 2019 (edit: he did), this will be the latest in a long line of mistakes Denver made at quarterback. All those mistakes can be tied back to Elway.
Since Manning retired in 2016, the Broncos have featured a revolving door at quarterback highlighted by wasted draft picks on the position, bad trades and head-scratching free agent moves -- basically the trifecta of quarterback failures. Nothing will hold a candle to Elway selecting Paxton Lynch, a player who is not even in the league anymore, in the first round of the 2016 draft, but the list of quarterbacks Elway handed the reigns of the team to is a who's who of bad players.
It's not Trevor Siemian's fault that he earned the starting job over Lynch in 2016, but Elway did draft Siemian and he was about as good as you'd expect any seventh rounder to be. That Elway didn't have a better quarterback on a team coming off a Super Bowl win is pretty baffling in general. But that's who he rolled out there to replace Manning.
After that, Siemian, Lynch and none other than another Elway second-round pick, Brock Osweiler, battled it out for the starting job in 2017. All got a chance. All sucked. Especially Lynch. And again, the Broncos failed to win.
(Also just want to point out here Elway picked Brock Osweiler in 2012 to be Manning's successor. Let's not forget that.)