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OREGON NOTES: Kelly on injury reports; Arizona on Autzen; updates on Thomas, penalties, O-line, Marshall, Mariota and more

Larry Scott, Pac-12 commissioner, has promised to raise the subject of a league-wide injury report with school athletic directors.

Oregon coach Chip Kelly has led the way in concealing injuries. Kelly does not talk about them in any way, except after last year's USC loss ("this team's as banged up as any team I've ever been around") and by closing practices.

His reaction to Scott's plan?

"I think the whole issue is silly," he says. "If you want to talk about it, talk about it; if not, don't talk about it. I don't think they need to tell us what to do."

• The Ducks play Arizona at 7:30 p.m. Saturday at Autzen Stadium (ESPN) — it's a pair of 3-0, nationally ranked teams.

The Wildcats, especially their seniors from previous trips, are aware of the raucous environment at Autzen.

"It's loud, that's what I remember," QB Matt Scott says. "Great atmosphere. It's going to be a great game."

The Ducks are ranked No. 3 in the USA Today coaches and AP polls. The Wildcats are 21st and 22nd, respectively.

"It's a big game for us," Scott says. "We have to put it all out on the field. It's win or lose. That's what this game is about."

• The Wildcats have a new, spread offense under coach Rich Rodriguez, and a 3-3-5 defense (three down linemen, three linebackers, five secondary players).

"They haven't seen a defense like we have," Scott says. "Our defense flies around, hits and tackles. Our defense will put it down for us."

• Versatile UO sophomore De'Anthony Thomas has 228 yards rushing and four touchdowns and 11 catches for 154 yards and three scores. Thomas is tied for the national lead with seven TDs.

His six rushing touchdowns in the calendar year 2012 (including the Rose Bowl) have gone for 59, 51, 39, 33, 64 and 91 yards (an average of 56.7 yards per score). He has 25 career TDs in 17 games, scoring in 12 of the past 13 games, and averages a TD every 5.2 touches.

Thomas, also a punt returner, leads the nation with seven all-purpose plays of 30 yards or more.

"I just try to get the offense started," he says. "Motivate other players. We've got to get the job done. Every time I try to make a play, I do it for my teammates."

• The Ducks have 28 penalties for 245 yards in three games. Kelly says the Ducks need to clean up things, or a penalty or penalties at the wrong time could really hurt them.

"In big games, those plays are going to cost us," defensive end Dion Jordan reiterates, particularly noting 15-yard personal foul (late-hit) penalties. "A lot of them were guys giving great effort, but you've got to know when to pull up. We're not going to pull anybody back from running full speed to the ball, but you've got to be smart about it."

Says QB Marcus Mariota, regarding false-start penalties and other offensive mistakes: "It's good to have that kind of stuff happen. It's stuff we can correct. There's a lot of young guys in this offense. It's a good learning thing."

On the subject of penalties, Thomas offered up the quote of the season (so far):

"I feel like we're a very disciplined team. We do a lot of things right. I just feel like sometimes the refs are against us."

• The offensive line has lost Carson York (knee) for the season, and linemen Tyler Johnstone, Jake Fisher and Kyle Long have nursed injuries.

Is the unit ready for the Pac-12 season?

"Absolutely," Fisher says. "We were prepared during fall camp. We had minor glitches here and there."

• True freshman Byron Marshall, the team's third running back behind Kenjon Barner and Thomas, rushed for 125 yards and a score against Tennessee Tech, albeit against a tired and demoralized defense in the second half.

"I just felt a lot more comfortable," he says. "The first game (against Arkansas State), I had a lot of built-up energy and anxiousness. This game, I kind of knew the difference between high school and college now. I got a chance to relax."

Kelly says that during one play in the opener Marshall didn't know it was third down.

"I did pay attention to (downs) a lot more (against Tennessee Tech)," Marshall says.

"Byron has really progressed since he got here in August," Kelly says. "I'm happy with some of the decisions he made (against Tennessee Tech) carrying the ball. He's got a big, big upside. You see him coming into his own."

• Quarterback Marcus Mariota has 674 yards passing and eight touchdowns and one interception; his 180.54 passer efficiency leads the Pac-12.

"From my first game to now, my confidence has grown," he says.

• Barner has rushed for 324 yards and six TDs. He needs 30 yards to move into the top-10 all-time at UO.

As opposed to big-play Thomas, "he gets those hard yards," Mariota says. "He doesn't have those flashy 60- or 70-yard TD runs. But to get those five yards to win first down gets us in a good situation. He's made this offense very efficient."

• The Ducks have scored 30 or more points in 16 consecutive games, the country's second-longest streak behind Oklahoma State (18). The Ducks are 35-2 when scoring 30-plus points in the Chip Kelly era.

• Oregon's rate of 15.6 percent (7 of 45) defending third-down conversions is third in the country behind Florida State (11.4 percent) and Oregon State (14.3 percent).

•Â Rob Beard is 0 for 2 on field goals (a miss, a block), and Jackson Rice has dipped to 36.4 yards on 10 punts.