In 2012, Alonso was especially effective against rival Oregon State (seven tackles, a tackle for loss, interception), Stanford (nine tackles, a tackle for loss, forced fumble), USC (10 tackles, two for loss, fumble recovery, interception) and six tackles, including two for loss, in Oregon's Fiesta Bowl victory over Kansas State. While scouts love his production (81 tackles, 14 tackles for loss, two forced and recovered fumbles last season), Alonso does come with significant red flags. Before the wrist injury, Alonso missed the entire 2010 season with a torn ACL and was twice arrested on alcohol-related offenses (2010, 2011) while in Eugene. If teams are convinced that Alonso has matured and is healthy, the versatile linebacker could warrant consideration as early as the second round. - Rob Rang, NFLDraftScout.com
Alonso had to overcome his share of troubles to become a difference-maker for the Ducks. He redshirted in 2008, spent 2009 as a reserve (16 tackles in 12 games) and suffered a knee injury in the spring which forced him to the sideline yet again.
Alonso returned to action in 2011 but had to work his way into the rotation. As the year went on he became increasingly involved and forecasted his ability to perform well in big games by posting a season-high nine tackles in the win over Arizona, six stops against USC, his first career interception against rival Oregon State, five tackles (including two for loss) against UCLA in the first ever Pac-12 Championship game and culminating with five tackles, 2.5 tackles for loss, 1.5 sacks and an interception of Wisconsin quarterback Russell Wilson to win MVP honors of the Rose Bowl.
Starting each game for the first time in his career, Alonso emerged as one of the country's better, if somewhat anonymous defenders. He started 12 games for Oregon, registering career-highs across the board with 81 tackles, including a team-leading 14 tackles for loss despite posting just one sack. He showed off his penchant for creating turnovers, as well, recording four interceptions and both forcing and recovering two fumbles. As he had previously shown, Alonso proved to be a playmaker in big games, enjoying especially standout performances against Oregon State (seven tackles, TFL, interception), Stanford (nine tackles, TFL, forced fumble), USC (10 tackles, two for loss, fumble recovery, interception) and six tackles, including two for loss in Oregon's Fiesta Bowl victory over Kansas State.
Having struggled a bit with off-field issues and injury, Alonso carries with him some baggage. In a draft class filled with more questions than answers at inside linebacker, however, he might prove to be the most dynamic of the bunch.
Possesses a developed, athletic frame with good muscle definition throughout. Rare athleticism for the position, which may result in a move to outside linebacker in the NFL. Highly instinctive defender despite his relative inexperience. Gets a jump on the ball and shows terrific straight-line speed, agility and a burst to close. Possesses long, strong arms to make the wrap-up tackle and flashes explosive hitting ability. Good flexibility and balance when dropping back into coverage and has the athleticism to handle responsibilities in man coverage. Good awareness in zone and possesses good hand-eye coordination and ball skills, overall. Surprisingly stout at the line of scrimmage, using his arm length and flexibility to get under the pads of blockers and create a pile for teammates to close on the football. High effort in lateral and downfield pursuit. Versatile defender who could prove to be a moveable "chess piece" for a creative defensive coordinator. Just starting to scratch the surface of his potential...
Only emerged as a full-time starter as a senior... Was not often asked to take on and shed blockers at the point of attack in this scheme, though when he did, Alonso's aggression and arm length were usually effective. Is a bit of an agitator on the field. Is very willing to play to and through the whistle when he can. Plays with reckless abandon, showing no hesitancy in leaving his feet or crashing into the pile, concerns only because of the fact that he's struggled a bit with injuries over his career, including missing the entire 2010 season with a torn ACL. Had agreed to play at the Senior Bowl but elected not to participate and instead allow his left wrist to heal after sustaining an injury to it earlier in the season. Has had multiple run-ins with police, though (to his credit) none over the past two years. Was charged with a DUI February, 2010, ironically just hours after Kelly had announced that Oregon would be ramping up penalties to players who ran afoul of the law. Alonso was also arrested on charges of burglary, criminal mischief and criminal trespass on May 1, 2011. He ultimately pleaded guilty to misdemeanor charges to avoid jail time.
Compares To: Daryl Washington, ILB, Arizona Cardinals -- Like his predecessor with the Cardinals, Karlos Dansby, Washington's blend of instincts, athleticism and physicality has quickly turned him into a Pro Bowler. The frenetic Alonso has a similar upside but must show the same level of commitment on and off the field that Dansby and Washington have undertaken to enjoy this kind of success.