So that's five of the seven coming back. Let's break it down by team.
Arizona RB Ka'Deem Carey is likely to get more carries in Rich Rodriguez's offensive system.
Ka'Deem Carey, Arizona: The Wildcats ran the ball the second fewest of any Pac-12 team last season (331 attempts), but Carey still managed 425 yards on 91 carries. Arizona will run the ball significantly more under Rich Rodriguez -- who usually has one of the top rushing offenses in the nation. His running backs had more success at West Virginia than at Michigan, where QB Denard Robinson sucked up most of the yards. Carey will be close and it might come down to whether Arizona plays a 13th game.
Cameron Marshall, Arizona State: He did it in a pass-first system on an injured ankle. Now he's in a run-first system and healthy. Do the math. Marshall should flourish in a downhill system. The Sun Devils have deep group behind him -- maybe the deepest in the conference -- but I can't imagine anyone cutting into his carries too deeply that it hinders his ability to get back to 1K.
Isi Sofele, Cal: There are mumblings that Cal might move to more of a committee approach and Sofele might not get the same number of carries as last year (252). Even so, he'll still probably be chairman of that committee and will have ample opportunity to reach 1,000 yards again. He'll get there.
Tony Jones, Colorado: The Buffs' offensive line might be their strongest offensive asset with standouts like tackle David Bakhtiari and center Gus Handler. That bodes well for Jones, who showed he can be very explosive backing up Rodney Stewart last year. But the Buffs spent a lot of time playing catch-up last season and couldn't commit to the run as much as Jon Embree probably would have liked (401 attempts). If they can't develop a downfield threat, Jones is going to see a lot of eight-in-the-box.
Kenjon Barner, Oregon: He was knocking on the door last year with 939 -- and that was behind LaMichael James and his 1,805 yards. Barner will see more carries than his 152 last season, though he'll still have to split carries with De'Anthony Thomas and the Ducks' new quarterback. Still, no one in the conference runs the ball more than Oregon so Barner shouldn't have any trouble getting there.
Committee, Oregon State: We know Oregon State wants to run the ball more. The Beavers were dead last in the conference last season in attempts (318) and rushing yards (1,043) and there are still issues on the offensive line that need to be sorted out. Several players are expected to contribute -- but chances are one individual won't get over 1,000 yards.
Stepfan Taylor, Stanford: The Cardinal have a committee approach, but even so, Taylor has gone over 1,000 yards in back-to-back years. The loss of guard David DeCastro hurts a bit, but the Cardinal are dedicated to the run and Taylor is a fantastic back. Shouldn't have any trouble three-peating.
Johnathan Franklin, UCLA: The new system at UCLA will be pass-oriented. But Franklin (976 yards last year) won't be completely ignored. Just look at Marshall's numbers from ASU when Noel Mazzone was running the show and you can see that running backs are still a big part of the attack. And the Bruins might run a little more until the new quarterback finds his way in the system. He'll be close.
Curtis McNeal, USC: He just cracked the club by five yards last season. This year he'll have the benefit of a 13th -- maybe even a 14th -- game to get there. Can't imagine many teams will stack the box and dare Matt Barkley to beat them with his arm. McNeal should clear 1K easily.
John White, Utah: No back carried the ball more in the conference and only three players in FBS football had more rushing attempts. There's no reason to think the Utes won't take that same approach. White is an explosive back who is a proven workhorse. If Utah can get the passing game going, it will open up more for White who could probably match his yards total with fewer carries.
Committee, Washington: Chris Polk was a special running back -- the kind of guy who could run for speed and run for power. He's gone and there are questions on the offensive line where there weren't last year. Jesse Callier and Bishop Sankey will probably headline the committee and Washington's balanced approach (52-48 run-pass ratio last year) will allow for plenty of opportunities for both. They should easily combine, but unless one steps up as an 18-20 carry-per-game back, it's unlikely an individual will reach 1K.
Committee, Washington State: The pie for carries is already small considering the offense. Then you have Rickey Galvin (1A), Carl Winston (1B) and Marcus Mason (1C) cutting into the pie even more to nibble on whatever slices are left. Running backs in Mike Leach's world are better used in the passing game on swings and screens in this offense. So don't expect a 1K rusher.