It's reloading time around the Pac-12. For some programs, the offseason challenge is more daunting than it is for others. Still, even Utah -- perhaps the league's most experienced team -- will be depending on multiple players to fill departed voids in 2015. So here's our team-by-team look at players who'll be called on to deliver key replacement production around the conference.

We'll continue our breakdown with Oregon.

The obvious spot

No big deal at the quarterback position -- nothing to see here, right? The Ducks are only losing the Heisman Trophy winner and most accomplished passer in program history. Kidding aside, it seems as if the media has sliced and diced Marcus Mariota’s departure and Oregon’s task of replacing him in every way possible, so we’ll stick with a brief summary of the situation.

For now, this is the extent of our knowledge: Jeff Lockie enjoyed a productive spring, while transfer Vernon Adams -- who put up big numbers in two games against Pac-12 competition while at Eastern Washington -- is one hurdle away from arriving in Eugene. The winner of their camp competition will be asked to play point guard and distribute the ball to a loaded stable of Oregon offensive weapons.

Retoolment of the offensive line

Three 2014 starters are gone, and two of them -- center Hroniss Grasu and left tackle Jake Fisher -- were absolute lynchpins up front. Tyler Johnstone’s return from a torn ACL -- an injury that sidelined him last season -- gives the Ducks a shot in the arm on the left side, but the interior of this line remains a construction zone. Former Notre Dame center Matt Hegarty's transfer to Eugene seems huge, but he'll have to acclimate to the plethora of duties that come with captaining the Ducks' offensive line. Matt Pierson, Doug Brenner, and Jake Pisarcik -- other names in the mix for action up front -- all played last year, so there is a sense of cohesion already present. Still, this unit must mesh into its new comfort zone to successfully replace its 2014 effectiveness. It should have the pieces to do that, but nothing is a lock yet.

A young secondary

While most focus has aimed at Oregon’s offensive changes, the defense has lost firepower. Ifo Ekpre-Olomu and Troy Hill, 2014’s two starting cornerbacks, are both gone. So is safety Erick Dargan. He was an all-conference selection, too. While the Ducks aren’t hitting the panic button, they are trying to take their surplus of wide receiver talent and apply it to their secondary. They’ve moved electric playmaking talent Charles Nelson to the defensive side of the ball, where he’ll join Chris Seisay, Ugo Amadi and Arrion Springs in a competition for reps at cornerback. There'll be plentiful inexperience on the perimeter, and that's obviously a cause for concern in a conference full of aggressive aerial attacks. But the Ducks do feel good about safeties Tyree Robinson and Reggie Daniels, both of whom bring experience to that position. They hope that'll help bring the fresh guys on the outside up to speed. If that happens, the pass defense can be effective again.

Replacing production in the front seven

There's been speculation that defensive coordinator Don Pellum may employ four-man defensive fronts with more regularity in 2015, a change that could potentially help Oregon mask the losses of defensive end Arik Armstead and linebacker Tony Washington. Tui Talia (6-5, 285 pounds) and hulking newcomer Canton Kaumatule (6-7, 295 pounds) are both powerful forces who can do damage in front of a linebacking corps that's filled with veteran experience but lacks the star power the Ducks have featured there in the past (see Kiko Alonso, Michael Clay). The goal up front, then, is to maximize involvement for scary, emerging defensive line talents alongside returner DeForest Buckner.