The day after Broncos general manager John Elway ended his internal questioning of whether coach Vance Joseph would stay or go, the two sat together at the team’s headquarters to admit mistakes and vow change.

Elway went first, saying he wanted to give Joseph another shot and that he also wanted to give his coach “the best opportunity to be successful” with some new assistant coaches and a revamped roster. “I don’t feel like we gave him that chance,” Elway said. “We had some positions that didn’t play very well, that I thought would play better than they played. That part is on me.”

Joseph chimed in soon after, admitting his shortcomings as a first-year head coach.

“Early on in the season, I didn’t do a good job of pushing our coaches to make the proper changes that I thought could have helped us,” he said. “I allowed guys to coach — that was my goal — but I wasn’t very good at coaching the coaches. I’ll get better at that.”

Since then the Broncos have made alterations to their staff while still devoting much of their time to evaluating on-field talent. After firing six assistants, they’ve hired seven new ones, changed the roles of a few others and will likely bring on a couple more to focus on development, to help the younger players adjust better and faster, and to help bridge the gap.

“You look at Philly and you look at Kansas City — we have to adjust also as pro coaches. We’re drafting these guys for their skill set that we see on tape,” Joseph said. “So we can’t take these guys and assume they can do something else. What we draft them for, we have to play to their strengths. … So we have to evolve as coaches also, take these kids’ skill sets and put it to work. So what we see in these players that we love, we have to apply to our game. It’s simple as that in my opinion.”

On the offensive line, instead of having just one primary coach and his assistant, the Broncos have split duties, giving new hire Sean Kugler the task of coaching the guards and centers. Chris Strausser, previously the assistant offensive line coach, will work with the tackles.

In the secondary, Marcus Robertson, a former 12-year safety, will remain the lead coach for the defensive backs. But the Broncos added Greg Williams, previously the Colts’ defensive backs coach, to focus on the cornerbacks. And, in the coming weeks, the team is expected to hire a coach to be a pass-rushing specialist working with the outside linebackers and the defensive linemen.

The Broncos have shifted away from the traditional coaching structure they’ve employed in years past and taken on an approach that’s becoming more common in the NFL — not just during the season, but in the offseason, too.

“As I travel around calling games for FOX, I see a lot of former players that have been brought onto rosters to do some coaching and to help out. It’s been interesting,” said former Broncos guard and current NFL analyst Mark Schlereth. “I’ve had a lot of teams over the years reach out to me about potentially joining staffs and one team I covered this year asked me to come out in the offseason and basically do a zone-blocking tutorial and spend time with the coaches in that realm, kind of almost as a consultant. I think you’re going to see more and more of that.”

Consider the Texans, who last year employed former slot receiver Wes Welker as an offensive and special-teams assistant. Or the Falcons, who have employed former players with lengthy NFL careers as coordinators, such as Bryant Young.

“A lot of teams are going in that direction because the less and less guys are allowed to practice, the more and more they need to have those discussions and to understand the nuance of playing this game,” Schlereth said. “I think there’s nobody that can give you a better sense of nuance than a guy that’s played it at a high level for a long time.”

The Broncos’ offensive line, a group that has struggled for years with development and cohesion, last year featured a rookie left tackle (Garett Bolles) and a rotating cast of right tackles that together were an improvement over the 2016 front five. But mistakes were frequent and the level of play was far from what many inside the Broncos’ building had sought.

The college-to-pro transition for offensive linemen is often said to be one of the most difficult in the NFL because of the knowledge and skill needed, not to mention the drastic change in physicality and scheme. When many tackles are drafted, they’re raw and they join a veteran group whose focus is no longer on developing technique but simply playing — playing together as a unit and playing well.

“In the pros, they just want you to get the job done so they can complete the pass, so they can get the run. They don’t care how you do it. They just want you to do it,” former Broncos tackle and current radio host Ryan Harris told The Post last year. “It’s imperative, and I think necessary, for offensive linemen to have a good technique base or, if not, have a good coach who’s teaching them technique because not every offensive line coach in the NFL teaches technique, which is mind-blowing.” Related Articles Jackson: Silence at empty Broncos, NFL stadiums never sounded so terrible

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The focused approach has become especially popular in the offseason, when players seek out skill coaches — coaches specific to receivers or defensive backs or quarterbacks, coaches for footwork, coaches for speed, throwing coaches and strength coaches. Broncos receiver Emmanuel Sanders often takes his maniacal training regimen back to Houston, where he works with receivers coach David Robinson and Rischad Whitfield, a trainer known to most as “The Footwork King.” Others have turned to Seth Minter, a former college receiver now known as “The FootDoctor” after working with the likes of Chad Johnson.

Current players are even finding ways to specialize on their own, as Broncos linebacker Von Miller did last year in orchestrating his first Pass Rush Summit at Stanford, where both current and former players shared secrets of their trade.

The Broncos have taken notice. In their still-developing look for 2018, they’ve changed their approach on the sidelines with hope of changing the outcome on the field.