Posted by ESPN.com's Ted Miller
One of the charms of college football is the mostly predictable roster rotation. Young guys break through, become stars and then leave after their third, fourth or fifth year. Then a new cast tries to fill the void.
While there are numerous size 36 EEE shoes to fill -- figuratively speaking, of course -- in the Pac-10 this spring, we'll focus on five here.
And because quarterback competitions across the conference are so obvious, we're going to make this a "non-quarterback" category.
Also note that spring is a time for the experimentation. Coaches love to mix-and-match players, so there might be some surprises we didn't anticipate.
Big shoes: USC LB Rey Maualuga
Stepping in: Sophomore Chris Galippo
Out goes everybody's All-American Maualuga, in goes everybody's 2006 prep All-American Galippo, a sure tackler who packs a punch at 255 pounds. He had 12 tackles, two coming for a loss, and an interception last season. He saw action as a true freshman before suffering a herniated disk in his back, an injury that also limited him last season. He seemed healthy the second half of the season, but back injuries are tricky. That might be the biggest issue standing between Galippo and future stardom.
Big shoes: California C Alex Mack
Stepping in: Junior Richard Fisher or junior Chris Guarnero
Fisher is a former walk-on and a vegetarian. For real. He was listed as the backup behind Mack last season. Guarnero started the first three games at left guard before suffering a season-ending toe injury. He is expected back for spring ball. With a new offensive line coach, Steve Marshall, and lots of returning starting experience -- seven players have started at least one game -- there might be lots of experimenting up front this spring.
Big shoes: Oregon DE Nick Reed
Stepping in: Junior Brandon Bair, junior Kenny Rowe, JC transfer Zac Clark
Reed had 20 tackles for a loss and 13 sacks last year (29.5 for his career). His potential replacements had no sacks last season. Some Oregon fans took issue with my suggesting in our "What to watch this spring," that Bair was the frontrunner to replace Reed. I wrote that because Rowe was listed at 215 pounds on last year's depth chart and was almost exclusively a pass-rush specialist. Meanwhile, Clark is an unknown quantity as an incoming JC transfer. On the other hand, Bair is more in the mold of returning big end Will Tukuafu, so perhaps Rowe, who's listed at 230 pounds on the updated roster, and Clark will battle it out. Guessing this one is wide open, to be honest.
Big shoes: Arizona State FS Troy Nolan
Stepping in: Sophomore Clint Floyd leads a pack of possibilities
Nolan had 64 tackles and four interceptions playing center field for the Sun Devils' defense, and he'll be the toughest guy to replace for a unit that should be fairly salty next fall. Floyd will get first crack, but junior Max Tabach, redshirt freshman Keelan Johnson and senior Jarrell Holman could make a move.
Stroughter was the Pac-10's only 1,000-yard receiver last year. Morales added 743 yards, while this duo combined for 15 of the Beavers 25 touchdown receptions. Catchings caught only seven passes but was No. 2 on the depth chart. Bishop was impressive while redshirting, particularly during Sun Bowl practices. And slot receiver James Rodgers figures to see more balls downfield this fall after mostly being a fly-sweep specialist the past two seasons.