6. Mitchell Trubisky
Does this one count? Sure it does. Mitchell Trubisky was drafted second overall by the Bears back in the 2017 NFL Draft; yes, the draft that included Patrick Mahomes going to Kansas City. Trubisky was given the reins as the team's starter all the way up until an abysmal first half in 2020 against the Atlanta Falcons. That Week 3 game saw Matt Nagy bench Trubisky in favor of Nick Foles, who would go on to start several games that season.
Trubisky would come back later to start a few games that year, including the playoff loss to the New Orleans Saints. He was, to be fair, a backup for a little while. He wasn't a great starter, but Trubisky is a strong backup at this point in his career.
5. Nick Foles
Funny enough, next up is Nick Foles, who came to the Bears by way of the Jacksonville Jaguars. The trade for Foles might not have been worth it, as they gave up a fourth-round pick. But, Foles came in as a guy who would become a phenomenal backup option.
After taking over for Trubisky during the 2020 campaign, Foles gave the Bears some hope. But, that would quickly fade, as Bears fans saw Foles' statue-like mannerisms become the downfall of the offense week after week. Still, Foles threw for over 2,000 yards, 11 touchdowns and eight picks in two seasons with the Bears, and I'd say that's not too shabby as a backup quarterback.