Winning without a good quarterback has always been a challenge, but that's especially true in the modern Pac-12. Having seen so many star quarterbacks like Marcus Mariota and Andrew Luck excel in this league from the minute they stepped under center, it's a given that solidifying your quarterback early is a big step toward a successful season.
Seeing names like Mike Bercovici, Cody Kessler, and Jared Goff all depart from their respective schools raises some questions on where their schools will go with the position, and they are not the only ones.
Plenty of quarterback talent is still present in the conference, but a good number of the 12 spots are still up in the air.
Liufau considered redshirting when former Texas Tech QB Davis Webb verbally committed to Colorado as a grad transfer, so that Liufau could be 100 percent healthy going into his final season in 2017.
Now, the tables have turned. Webb flipped his commitment to Cal, and the only thing standing in Liufau's way of a big senior season is the complete recovery of the Lisfranc injury he suffered in November to his left foot.
In his third year as the starter, Liufau was one of the lone bright spots for the Buffaloes in 2015 in the 11 games that he played. He contributed 14 total touchdowns in the air and on the ground, and threw for 2,418 yards while rushing for 266. Fully healthy in his junior season, Liufau threw for 3,200 yards and 28 touchdowns.
One of the three true freshmen in the conference to start under center last season, Rosen found the most success. He was fourth in the Pac-12 in passing yards per game, and threw for 23 touchdowns.
His second season should be even better. Rosen did have the second-most interceptions last year with 11, and his 60% completion rate can improve.
Losing his two favorite targets from a season ago (Thomas Duarte, Jordan Payton), Rosen's role will be all the more important to find new hands to throw to, especially after losing running back Paul Perkins to the NFL.
Another member of the 2015 true freshman trio, Browning played the role of game manager as the breakout Husky defense and running game carried the team. But that doesn't mean Browning didn't have his moments.
Ten of his 16 touchdowns came in a four-game stretch, including two games in which he threw four touchdowns. He finished the season in the top half of the conference in completion percentage, one of two underclassmen in those ranks.
Teaming up with fellow sophomore running back Myles Gaskin - one of the most surprising players in the conference in 2015 - will be something Washington fans will pride themselves on this season and rightfully so. A full season under Browning's belt should be enough reason to think Washington is due for a breakout season.
Falk took the college football world by storm last season and was the ultimate chess piece to Mike Leach's air-raid that put the Cougars on the map. He led the conference in completions, attempts, and yards per game, all while throwing the fourth least interceptions for quarterbacks who threw at least 100 passes.
WSU was one atrocious loss, a last-second field goal, and one Falk-less game away from losing only one game last season, and with two of their top three receivers from last year returning to Falk's arsenal, the Cougars are just as dangerous, and Falk can be even better.
Anu Solomon is expected to return as the starter for his redshirt junior season, but redshirt sophomore Brandon Dawkins has been in competition for the starting job after Solomon suffered a minor hamstring injury during the spring.
For a guy who has thrown 48 touchdowns in his first two seasons to not be named the starter in the spring must mean Dawkins is a pretty legitimate threat. The good news is that Arizona has it much better than other Pac-12 teams considering they have a veteran with prior success on their roster.
With Mike Bercovici's departure, the Sun Devils are left with quite possibly the most inexperienced group of quarterbacks in the country.
With fall camp two months away, the Sun Devil quarterback battle will be one to keep an eye on. Especially considering no quarterback has any sort of edge following spring practices.
As Cal's spring camp came to a close, their four-man quarterback competition appeared to be narrowed down to two - Chase Forrest and Ross Bowers. On May 18, a whole new player was added to the game as Texas Tech's Davis Webb decided to make full use of the graduate transfer rules and commit to Cal for his final season of eligibility.
Many are expecting Webb to eventually win the starting role considering he flipped his commitment with only one year left on his plate, and jeopardizing his final year of eligibility doesn't seem likely. But Cal has not officially announced anything, so the once-thinned competition has become one man bigger heading into fall.
The Ducks made a mirror move to last offseason, signing one of the best FCS quarterbacks the league had to offer. Dakota Prukop transferred from Montana State to play FBS ball in his final year of eligibility, much like Vernon Adams did last season. Much like Adams, the job won't be handed to him.
Adams had to earn his time after missing spring camp, but Prukop enrolled early and participated in the spring practices. His counterpart, redshirt freshman Travis Jonsen, has been giving Prukop a run for his money in this competition, and following the Ducks' spring game it was unclear who had the upper-hand.
Following the near loss of Seth Collins to Northern Illinois, the Beavers have brought back their seven-game starter in 2015 to participate in a competition with a pool of quarterbacks.
Collins will be in contention with Darell Garretson, Marcus McMaryion, and Mason Moran. Garretson likely has the edge following the spring game, but Collins' return makes this competition a lot more interesting give this experience last season for the Beavers.
Kevin Hogan was one of the steadiest quarterbacks in the Pac-12 in his four years as the starter, and now Stanford will be looking for only its third quarterback in eight seasons.
That job is for Ryan Burns and Keller Chryst to win, and following the Cardinal's spring game, neither quarterback has stood out as the clear winner. This may be the most difficult decision to make of any quarterback battle in the conference.
Between Brandon Cox, Tyler Huntley, and Washington transfer Troy Williams, the Utes have quite the QB battle of their own trying to replace the highly-efficient Travis Wilson. An injury to Williams late in spring may have set him back for not, but Head Coach Kyle Whittingham insisted the need to get Williams back on the field.
Much like most of the other QB competitions, no clear candidate has emerged through the spring.
Max Browne is the lead candidate to replace Cody Kessler, but the competition is still open for Sam Darnold going into the fall. Regardless of who lands the job come week one, they will have plenty of weapons at their disposal.