Every time I read the reports on these guys one of the first things that comes out is vocal leadership. Especially with Wood - it describes him as someone that on Louisville would get in other linemen's faces and when he talks, they listen. Levitre same thing. Arrington for all of his faults in his career is mentoring (with Poz) Maybin, who has been mentioned as a guy on defense who told the staff this would be his year.
Even the DBs are guys who hit, compete and want to play football, not be the sexy cover corner. Byrd has kicked butt in the PAC-10, Harris has been playing linebacker at Safety at OU for years, Harris (USC) has played against Sanchez and company, has competition from the faster freshmen and still started for 4 years. Langster at the worst is a special teamer and wants to make this team.
I especially like Levitre and Wood though - those two are just plain nasty. Levitre as Bill said may be more of a technician, but Wood...he's going to jack some guys up.