BOURBONNAIS — As bright mornings turn to hot afternoons at Bears camp this summer, Dowell Loggains can be found standing alone on the sideline.

With a paper script in one hand and walkie-talkie in the other, the second-year offensive coordinator is overseeing the team’s quarterback restart. He is calling plays, correcting mistakes and setting the pace.

Loggains has been given the ingredients. Now he and position coach Dave Ragone are cooking the meal. And Friday, after the Bears practiced on a brisk, windy afternoon, Loggains offered a progress report in his only scheduled media availability of the preseason.

Seven of the first eight questions were about Mitch Trubisky, a noteworthy and unsurprising glimpse of where the public’s curiosity is centered six days before the first exhibition against the Broncos.

The other question? About rookie tight end Adam Shaheen.

Since Trubisky was drafted second overall, he has grown most, according to Loggains, in his understanding of the offense and how to read NFL defenses.

“It’s a lot for a guy who has never taken a snap in pads under center,” Loggains said.

Helping the cause is longtime defensive coordinator Vic Fangio, who has a full arsenal of coverages for his unit to practice. Trubisky has gotten to see those while quarterbacking the third string and, rarely, the second team.

For the rookie, pre-snap responsibilities are a major point of emphasis as he transitions from a North Carolina offense that did not require as many adjustments.

How is Loggains measuring progress in that area?

“Just where he puts his eyes, No. 1,” Loggains said. “If he’s diagnosing the defense right and reading keys, safeties, the leverages of the nickel (back) and all those things, when he starts his progression we just see his eyes where they’re supposed to be.”

Then the challenge is going through those progressions, moving from the first option through the fourth, if necessary, based on the coverage. Full-field reads were not a predominant part of the offense Trubisky ran in college, so he’s working on that this summer.

Once Trubisky identifies the side of the field that’s best to attack, progressing through the receiving options is much easier.

“That’s where the biggest growth comes for a young quarterback,” Loggains said.

The coordinator acknowledged Trubisky’s difficulties with the center-quarterback exchange, saying there have been “too many balls on the ground.”

But the traits that attracted the Bears to Trubisky are evident. The foundation is there.

“He’s really accurate,” Loggains said, noting how on short throws Trubisky can position receivers to run after the catch. “It’s huge, it’s critical. And obviously he does throw a really good deep ball.”

As for starting quarterback Mike Glennon, Loggains appreciates the more advanced level at which the veteran is able to handle the pre-snap checklist. Plus, the ownership Glennon has taken of the starting job has included fostering chemistry with a group of receivers that is also developing.

“I think Mike has an understanding of where a receiver is supposed to be (and) when he’s going to get there,” Loggains said. “ Each guy is different. Some of that comes from learning what your guy does well and what his strengths are.”

Loggains said he and other coaches have not determined the playing-time division for the first exhibition. Their focus has been on the more immediate challenges of getting the new quarterbacks and the rest of the offense ready to handle an opponent.

As the outside intrigue continues, he remains in the kitchen hard at work.

rcampbell@chicagotribune.com

Twitter @Rich_Campbell