I watched most of Oregon's games this year, mainly because they're fun to watch. I can't say I know a lot about Alonzo's overall game, but you hear his name a lot on the broadcasts. Phil Steele has him listed at 6'4" 246 in his preseason guide. Don't know his speed but he always seemed to be around the ball. No clue about him dropping into coverage though. Still, for a guy who probably won't be drafted, IMHO in the first 3 rounds, he's one to watch.
Bucky Brooks has him as the number 3 ILB right now. His stock will rise.