Spring practice has begun its roll around the Pac-12, so the table is set for a bevy of position battles that should last the course of the entire offseason. That means it's time to highlight the key fights around the conference.
The quarterback cases
A year after the Pac-12's "year of the quarterback," the conference sees its marquee position enter a state of transition this spring. Plenty of top-flight talent has departed, but an influx of emerging signal-callers has the potential to take at least some sting out of the exodus.
Oregon's saga will generate the most headlines. Heisman Trophy winner Marcus Mariota is gone, while electrifying dual-threat talent Vernon Adams has transferred to Eugene, Oregon, from Eastern Washington. Coach Mark Helfrich's succession plan isn't determined yet, though: Jeff Lockie was last season's second-stringer, and he'll have a chance to get a jump on Adams -- who can't enroll until fall -- during spring practice.
Less than an hour up the road, Oregon State is tasked with replacing all-time Pac-12 passing leader Sean Mannion. The Beavers are confronted with a traffic jam of their own at the position, as seven quarterbacks currently pack the roster. Luke Del Rio was Mannion's backup last year, so he's a popular name right about now. Expect plenty of maneuvering as the entire stable adapts to Gary Andersen's new offensive system.
Jerry Neuheisel made a memorable start in Brett Hundley's stead against Texas in 2014, but that might have been just a prelude to what's expected to be a fierce offseason quarterback battle at UCLA. Josh Rosen, one of the most highly touted prospects in the nation, has also entered the Westwood fray.
Intrigue extends further into the conference. Luke Falk will likely be Connor Halliday's successor at Washington State, but the fates of incumbents Cyler Miles (Washington) and Travis Wilson (Utah) are far from settled. K.J. Carta-Samuels looks to steal the reins in Seattle. At Utah, Kendal Thompson's challenge of Wilson for the starting job, which raged throughout most of last season, will continue following Thompson's recovery from injury.
The defensive battles up front
Stanford, the Pac-12's best defense three years running, is currently competing to reload a unit that lost eight starters following 2014. The most painful attrition for the Cardinal has happened along the defensive line, where all three of last year's starters are graduating. Coach David Shaw actually wishes he had more competition there, since injuries have reduced Stanford to only three healthy players at the position. But Aziz Shittu and Solomon Thomas will be back, and the fight to replace Henry Anderson and David Parry will rage on in due time.
Washington, meanwhile, is tasked with replacing six members of a front seven that was stocked with pro talent in 2014: Danny Shelton, Hau'oli Kikaha, Shaq Thompson, John Timu, Andrew Hudson, and Evan Hudson. Ouch, ouch, ouch, ouch, ouch, and ouch -- all of those guys are leaving. That's a tough rash of losses. Brace for a free-for-all of competition in Chris Petersen's second year. Meanwhile, a few hours to the east, two spots are open on Washington State's defensive line.
The offensive trenches
Most of Cal's rising offense returns in 2015, but there's a big battle for Chris Adcock's vacated center position between Matt Cochran and Addison Ooms. Both Arizona schools should see spirited competition among the offensive hogs, too. The Wildcats must fill three holes up front, including center. Carter Wood is the front-runner there, and Cal transfer Freddie Tagaloa throws his name into the tackle ring. He is 6-foot-8, 330 pounds -- that sounds fun.
Arizona State tackles Jamil Douglas and Tyler Sulka are both gone, setting up a critical reloading effort to ensure that Mike Bercovici is well protected next season. Evan Goodman and Billy McGehee seem to be the early leading options, but nothing is a lock at this point.
Colorado has lost both starting offensive guards to graduation, and there are four bodies currently competing for those two spots.
The running back room always seems to be crowded at USC, and Javorius Allen's departure has set the table for a wide-ranging battle this offseason. Allen was the Trojans' leading rusher, but the next six performers on the ground-yardage list come back in 2015. Justin Davis and Tre Madden are the only two scholarship backs returning, and they'll be joined by a trio of freshmen from Steve Sarkisian's monster 2015 recruiting class -- Ronald Jones II, Dominic Davis and Aca'Cedric Ware.
Of course, the departures of Nelson Agholor and George Farmer have also opened matters up at receiver for USC. Expect plenty of explosive fireworks there: JuJu Smith and Adoree' Jackson are just two of the exciting names on the Trojans roster.