Utah’s defensive tackle room doesn’t need a reminder of what went wrong against Kansas State. It has the film, and it has the bruises.
Joe Jackson’s 293-yard, three-touchdown eruption against the Utes last season was one of the most eye-popping performances anyone put on a Utah defense. Kansas State piled up 472 rushing yards in that game, with Jackson doing the heaviest damage and other Wildcats adding 179 more. And somehow, Utah still escaped with a wild comeback win.
The very next week, Kansas gashed the Utes for 290 rushing yards in another Utah victory. That kind of back-to-back damage is not what people expect from a program that usually prides itself on shutting down the run. In 2025, Utah finished No. 108 nationally in rushing yards allowed per game at 181.2, a number skewed heavily by the final two regular-season games, but still a jarring mark for a team that’s built a reputation on physical defense.
For defensive coordinator Colton Swan and defensive tackles coach Luther Elliss, the offseason answer has been simple: go back, watch it, fix it.
“We’ve been watching a lot of old film from last year, like K-State. They really ran a lot of yards on us,” said sophomore defensive tackle Pupu Sepulona. “We had to really fix up on how to not make those same mistakes again for this season.”
The mistakes were easy to spot on tape, especially when blocking schemes started to stress Utah’s front.
“Especially for example, how guards would pull and we would just shoot the gap and the other gap would expand,” Sepulona said. “One thing about our DC, coach Swan, and also my position coach, coach Elliss, they recommend us D-tackles to play with hands, play with technique and not shoot the gap.”
That lesson matters even more because this is a young, unfinished group. Utah lost Aliki Vimahi to graduation, while Jonah Lea’ea transferred to Michigan and Dallas Vakalahi moved on to Penn State. That’s a lot of experience out the door, but the cupboard isn’t bare.
Karson Kaufusi and Sepulona both logged meaningful snaps as freshmen, which gave Utah a foundation to work with. Kaufusi played 177 snaps, finishing with 13 tackles and 0.5 sacks. Sepulona played 137 snaps and posted 13 tackles and a tackle for loss.
Sepulona expected a quieter first year, but injuries ahead of him and a long list of Utah blowouts pushed him onto the field sooner than he imagined. Even making the travel squad to start the season gave him a boost.
His first college snaps came in the opener against UCLA, and he said things started to slow down against Cal Poly, where he recorded his first tackle for loss. He added four-tackle games against West Virginia and Colorado, plus another tackle for loss against the Buffaloes.
“Being able to be on the travel squad really built my confidence,” he said. “From there, playing and getting playing time in the games against UCLA, Cal Poly, Wyoming, West Virginia, Colorado, Texas Tech, and all against big schools in the Big 12, that really built my confidence and (let me) really see my talent against the other talented players from other schools.”
He also spent every day banging against one of the more talented offensive lines in the country in practice, which only sharpened his game. Like most freshmen, he had his rough spots - his Pro Football Focus grade sat at 59.5 - but the West Virginia and Colorado games offered a glimpse of what he could become.
Since the Las Vegas Bowl win over Nebraska, the defensive tackles have been working with strength coach Steve Saunders to add size without giving up movement. Elliss said that part of the process has gone well.
“The strength coaches did an excellent job in helping them to get on the mass, to get bigger, get stronger, but not lose speed or quickness, and it’s translating to the field currently right now,” Elliss said.
The group looks bigger across the board. Sepulona is 298 pounds, Kaufusi 305, Wyoming transfer Lucas Samsula 306, Tennessee transfer Jamal Wallace 313 and Dilan Battle 320. San Jose State transfer Jireh Moe is the lighter one in the room at 280, but he brings the kind of burst that makes blockers work harder than they want to.
Moe, a sophomore, had 28 tackles and 1.5 sacks last season. He was also San Jose State’s highest-graded defensive player by Pro Football Focus at 83.2, and he’s in the mix to start for Utah. Samsula, another sophomore, brings the same 28 tackles and 1.5 sacks to the table and figures to be part of the rotation alongside Sepulona, Kaufusi and Moe.
Utah is banking on the sophomores to take a real leap, while the transfers provide immediate help. Moe likes what he sees so far.
“The room is progressing right now. I believe that we’re getting better and better every day.
We just got to keep on stacking days,” Moe said. “Yes, we have a chip on our shoulder.
We got lots to prove, and we’re going to prove it.”
For now, the questions remain. The answers will have to show up on Saturdays. But inside the room, the confidence is there.
“Everybody has a role and I feel like our room has so much potential to ball out this season,” Sepulona said.
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