To even be in the discussion as a defensive player you have to either score or generate a lot of turnovers
Comparing LB stats is a fruitless mindnumbing exercise in futility.
For starters, teams with great defenses (ND Top 2 in the country) are not going to be on the field long; teams with great defenses also have other solid defenders making tackles around them.
Additionally, if your team is on offense a lot (ND #11 in Time of Possession) you have even less opportunities on defense to make plays.
Manti Teo is not a Heisman candidate or a Top 10 projected draft pick for his on-field numbers...and for those that get that, props to them.