Earlier this week, the Chicago Bears announced Mitchell Trubisky had won the starting quarterback's job after much offseason debate. However, had he played only the Detroit Lions over the past two seasons, there might not have been any debate about Trubisky job security.

For all the questions he’s endured and all the heat he’s taken while competing with Nick Foles, Trubisky has been close to perfect whenever he’s played Detroit under Matt Patricia. The Lions host the Bears on Sunday (1 pm ET) at Ford Field.

“Trubisky has done a great job against us,” Patricia said. “He’s obviously very athletic, mobile quarterback. He gets the ball out extremely fast.”

While those traits are true, it doesn’t totally explain why Trubisky has been more efficient and accurate against Detroit than almost anyone else.

In three games against the Lions, Trubisky's completed 74.7 percent of his passes – better than he’s done against any other team in the NFL the last two seasons. He’s thrown for nine touchdowns – more than he’s done against any other team in the NFL the last two seasons. And the 866 yards he’s thrown for in three games – and three wins – in that time span is second only to the 968 yards he’s thrown against Green Bay.

That’s seven percentage points higher than his average around the league and the 9.52 yards per attempt Trubisky averages against the Lions is significantly better than the 6.7 yards per attempt he averages against the NFL.

The Lions are one of nine teams Trubisky has played the last two years where his completion percentage is above expected, according to NFL Next Gen Stats. And in three games against the Lions, 39.6 percent of Trubisky’s throws have gone for first downs. He’s only been better against Tampa Bay and San Francisco, but he’s faced those teams only once.

Part of it could be, as it has been with so many quarterbacks who have faced the Lions in Patricia’s two seasons as head coach, a lack of pressure. The Lions blitzed Trubisky just 9.6 percent of the time the last three games, one of two teams choosing to blitz him less than 15 percent of the time. And the Lions got pressure on 23.1 percent of his dropbacks – not bad considering the blitzing – but it still led to inefficiency for the Lions.

Lions defensive end Trey Flowers said the Lions have to keep Trubisky in the pocket. Detroit did that well the last two seasons and it didn’t matter.

“We have to keep him in the pocket. We have to rush with great awareness when it comes to him being capable of running the ball on the read option, things like that, and the read zones, just being disciplined and that’s all the way across the board.

“So when you take a look back, we didn’t have preseason and stuff to see but we take a look back at some of the things they hurt us with. We definitely can know that we’ve got to keep him in the pocket and make him uncomfortable in the pocket.”

Flowers said the Lions letting him get out of the pocket last season gave his receivers time to get downfield and that when he can extend plays for six or seven seconds, “that’s a tough task for the guys on the back end.”

Trubisky stayed in the pocket (2.69 seconds) longer than against any other team in the league and held on to the ball longer (2.83 seconds) than any team he played other than New England and Miami. And while these numbers are mere fractions of a second different than when he faces other opponents, when it comes to time to throw, those fractions of a second add up.

Detroit has tried to mix up coverages against Trubisky. According to ESPN Stats & Information, the Lions had close to a 50-50 split lining up man vs. zone against him (54.8 percent man; 43.3 percent zone) – primarily rotating through a Cover 2 (14.6 percent) and Cover 3 (21.4 percent) when they’ve not played man.

It is what Detroit plays and how the Lions play it, Chicago receiver Anthony Miller said, that is partially the reason for the Bears’ success.

“Just the schemes they play,” Miller said. “I feel like we take full advantage of the defenses they come with. I feel like we will be prepared this week as well.

“We don’t think they’re going to change their defense too much. But in any situation, I feel like we’ll adjust well either way.”

So far against Patricia, the Bears have done that. The Lions played a little bit more man than Trubisky saw on average (47.8 percent) – and even though Trubisky has been a more effective passer in terms of completion percentage against zone, he’s taken more advantage of man coverage, throwing 28 of his 41 touchdowns the last two seasons against man coverage.

The Lions didn’t disguise too much of what they were doing, though, as just 9.7 percent of Trubisky’s dropbacks saw a coverage other than what was shown pre-snap.

Neither one was particularly effective for Detroit. Trubisky had a lower completion percentage against man (66 percent) than zone (87.5 percent) but he also threw seven of his nine touchdown passes against the Lions in man.

The Lions will have a new defensive coordinator Sunday. Cory Undlin will be calling plays for the first time in the NFL. Perhaps, he’ll have something new for Trubisky, because what the Lions have shown him so far clearly hasn’t worked.

Information from ESPN Stats & Info was used in this story. Follow Stats & Info on Twitter @ESPNStatsInfo.