SOUTH BEND, Ind. — James Onwualu and Brian VanGorder came to the Irish defense at the same time back in 2014, when Onwualu was moved from wide receiver to (briefly) safety right around when the now-former defensive coordinator was hired.

Under VanGorder’s watch, Onwualu developed into a reliable outside linebacker and ultimately a senior captain. So when Notre Dame fired VanGorder on Sunday — a day after the school’s student section chanted “Fire Van-Gord-Er” during that brutal loss to Duke — it wasn’t necessarily an easy piece of news to digest for Onwualu and some of his teammates.

“Obviously everybody was talking about it, even our student section seemed to have a strong stance on that,” Onwualu said. “It was shocking to me. Obviously this is the only defensive experience I've ever had. He's really all I knew defensively. So it's difficult for some older guys, you know, and me included to put that aside and just take the next step into something new.”

But that’s what Notre Dame has to do with VanGorder’s rocky tenure in the rearview mirror and Greg Hudson taking over as defensive coordinator, with coach Brian Kelly taking an increased role in his team’s leaky defense.

Players understood why the move — which came in the wake of Kelly’s postgame comments saying everyone’s job wasn’t safe — was made, turning to the “it’s a business” line more frequently seen in a level of the sport in which the players are paid (which isn’t to say they’re wrong for viewing college football that way).

“It was a bit surprising,” junior linebacker Nyles Morgan said. “I knew him personally obviously playing defense, but it’s a business. And so we’ve really bought into what coach (Greg) Hudson’s been saying, and we have to move forward. We can’t linger in the past.”

It’s not like Notre Dame players were blind to the problem, though. The team’s first sack of the season came when Morgan dropped Duke quarterback Daniel Jones on Saturday, and the defense allowed 50, 36 and 38 points in Notre Dame’s three losses.

“The whole defense knows that we need to play better ball, and obviously if we were playing better ball, that maybe not would have happened,” Onwualu said.

Safety Drue Tranquill said he felt some guilt about the firing of VanGorder and had sympathy for his now-former coach.

“It wasn’t just coach VanGorder’s fault, the entire defense was struggling as a whole,” Tranquill said. “And he happens to be the leader of that. This is a really cutthroat business and I personally feel a sort of responsibility on my end. I can’t just watch the leader of the defense walk out and lose his job. It’s a really hard situation and it’s just real life.

“It’s just this industry and it’s really cutthroat. So part of me really felt for him. But a part of me realized he probably wants me to rally around the guys in the locker room and he probably wants me out there giving it my all each and every day and not worrying about him, because it’s about Notre Dame. It’s about Notre Dame winning football games, so we just have to come in, positive mentality, and move forward.”

On the offensive side of the ball, both quarterback DeShone Kizer and left tackle Mike McGlinchey said they fully trust Kelly to do what’s right for the team. And in this case, that meant making a change at defensive coordinator.

“We lost a great coach, but things needed to happen for us to move forward,” Kizer said. “Coach Kelly makes the decision. We trust in whatever he has to say, and moving forward we'll make the adjustments that need to be made on the offensive side of the ball to pick up our defense and to start playing games and getting W’s.”

“The reaction from us is that football is the way it is and coach Kelly felt that there needed to be a change, and so we made it,” McGlinchey added. “And obviously it's tough when it's a mid-season change and guys are connected to coach VanGorder, and have a guy on our team that is his son (reserve quarterback and holder Montgomery VanGorder). But at the same time everybody understands that changes needed to be made, and that's the decision that coach Kelly made. So we all are behind it.”

Notre Dame players talked quite a bit about how enjoyable practice was on Tuesday and Wednesday, which would seem to fly in the face of the team’s 1-3 record and uncertain chances of becoming bowl eligible this year. Kelly said he fired VanGorder as part of an effort to bring more passion and fun to a team in need of a spark, but knew the decision wouldn’t sit well with everyone on his team.

Regardless of how the move was received, it’s the one that was made. And Notre Dame needs its defense to play better going forward, otherwise a season that’s teetering on the brink of disaster could go careening over the edge.

“He was really the one that gave me the opportunity and spent the time and invested in me to be able to play defense and to be able to be where I'm at today,” Onwualu said in describing the conversation he had with VanGorder after his firing. “So just a quick thanks for the opportunity and the time that you spent with me. I don't think it's a huge good-bye. It's like anybody you work with, right? It's a business, you know. Stay in contact and I hope your next step is a good one.”