Ranking the 2015 Pac-12 offenses: Oregon still has best offense in Pac-12

1. Oregon

Lose three All-Americans one of which is a Heisman winner... no problem. The Ducks still have the best offense in the conference. The rest of the Pac-12 has made no progress on slowing their seemingly-unstoppable scheme, Royce Freeman and Thomas Tyner might be the nation's best RB combo and they have the best receivers in the conference. The key to the Ducks staying on top will be replacing two All-Americans on the offensive line and how well grad transfer Vernon Adams or Jeff Lockie can replace Marcus Mariota.

2. Cal

The Bears may be a complete mess on defense, but their offense can put up infinite yardage and score some points. The Pac-12's best QB Jared Goff has a fleet of great receivers to throw to in the Bear Raid, a developing offensive line and a 1,000-yard rusher in the backfield in Daniel Lasco along with a homerun hitter in Khalfani Muhammad.

3. Arizona State

As long as Mike Bercovici plays like he did when filling in for Taylor Kelly in 2014, this should be a killer unit. They have the best interior offensive line in the conference, a versatile star in former running back, now receiver D.J. Foster and two young stars in the making at running back. Plus, Todd Graham seems to have a handle on keeping the Sun Devil offense humming year-after-year.

4. USC

Senior QB Cody Kessler is poised for a huge year and as long as he can get some receivers and tight ends to emerge alongside star in the making Juju Smith, this offense will be dynamite. The best part of the Trojan offense will likely be an offensive line built around the conference's best in Max Tuerk and is filled out by young stars. Put all of this into Steve Sarkisian's high-speed offense and a lot of results are going to come out of USC on offense.

5. Arizona

Predicting that Rich Rodriguez' offense at Arizona will be amongst the Pac-12's best is always a safe bet. Anu Solomon and Nick Wilson are already a deadly QB/RB duo and the receiver group is talented and deep. The key here will be how the offensive line rebuilds after losing their three best starters from 2014.

6. Washington State

The Cougars will pass for nine million yards in Mike Leach's offense, everyone will wonder if Luke Falk is actually a good quarterback or just part of a system, a fleet of solid receivers will put up good numbers and they will give up a lot of sacks. You know the drill. All things considered, the offense is undoubtedly productive.

7. UCLA

This offense would have been near perfect had Brett Hundley come back for his senior year, but likely having to wheel out a true freshman at quarterback, albeit a very talented one, makes this group a bit of a question mark. Outside of quarterback though, the Bruins have a star running back in Paul Perkins, a very good receiver group led by Jordan Payton and a group of offensive linemen that should come of age around senior center Jake Brendel and form one of the conference's best units.

8. Colorado

The Buffs' defense is still a liability, but their offense has come a long ways under Mike MacIntyre led by underrated junior QB Sefo Liufau. The offensive line is likely still a mess, but they have a nice thunder and lightning combo at running back with Christian Powell and Malcolm Adkins II, the conference's best receiver in Nelson Spruce and an emerging playmaker in Shay Fields.  This is a nice unit that should give Colorado a chance to win some games.

9. Stanford

Even when they were at their best, the Cardinal offense was rarely prolific and mostly about getting the job done in their scheme. I think the offense will improve after a bad 2014, but still be in the lower half of the conference unless some key players can really step it up. The biggest keys are whether senior QB Kevin Hogan can morph from caretaker to playmaker and if an offensive line loaded with blue chip recruits can improve after an underwhelming 2014.

10. Utah

The Utes aren't really known for offense as of late, but running back Devontae Booker should rack up a lot of yards running behind a solid offensive line. Senior QB Travis Wilson is probably still a caretaker at best and he has limited weapons at receiver that should hold this offense back.

11. Oregon State

The Beavers enter the post-Sean Mannion and Mike Riley era with a lot of questions. They have some solid playmakers at receiver and an offensive line that has experience and will be bolstered if All-American candidate center Isaac Seumalo can get healthy and block for Storm Woods.

12. Washington

The Huskies didn't have a great offense last season and now they lost four of their five offensive line starters and their quarterback. This could be one of those addition by subtraction situations, but that is a big if.