After all, the Bears gave up a fourth-round pick to acquire Foles from the Jaguars, and he's plenty familiar with coach Matt Nagy's offensive system from their shared days with the Eagles and Chiefs.
But beyond the Bears' previous investment in him, the 25-year-old Trubisky might have another development in his favor in his quest to win the starting job -- that would be Chicago's schedule.
The Bears' opener comes against the Lions, against whom Trubisky has fared well in his NFL career. In three starts against Detroit in the Nagy era, Trubisky is 3-0 with a 74.7 completion percentage while averaging 288.7 passing yards per game and accounting for 10 total touchdowns against just one interception.
In Score host Joe Ostrowski's mind, that gives the Bears more to think about as they weigh their starting quarterback decision.
"The National Football League made a path for Trubisky to be the Week 1 starter," Ostrowski said on his afternoon show Friday. "I don't know that it's going to happen, but now we have a case. And we can discuss this for months and months. Just saying, would it really be shocking if the Bears announce, 'Our Week 1 starter is Mitchell Trubisky'?"
"Here's why: Because with Trubisky playing, Matt Nagy teams have dominated the Lions. Under Nagy, Mr. Biscuit is 3-0. And it's not just the defense winning those games -- they're actually scoring points, something we really haven't seen over the past year-and-a-half.
"In three games, Trubisky's rating against the Lions is 132.4 because for some reason, Matt Patricia insists ... on playing man defense against Trubisky. When we all know he has issues with zone, he sticks with man. So Foles may be the better quarterback -- in fact, we all know that he is, he's the better quarterback -- but you can make a case for starting Mitchell Trubisky. And if you win that game at Detroit in Week 1, Bears are favored by five against the Giants at the moment (in Week 2).
"I find that fascinating."