Te'o actually played in a cover 2 system, or rather a heavy split safety system. Conservative as hell, dropping way deep, everything in front of you. Thing is, he was never the prime cover guy in that system. He'd drop deep but you rarely saw him run up the seam with a TE. Lots of quarters coverage, safety had his back. ND rarely blitzed their OLB, they were more cover guys than pass rushers. They used Slaughter as an OLB even though he's a SS, so they could keep TE/Y in check. Spond was used in that position, dog backer, this year and he did a pretty good job, guy to keep an eye on. Dog backer is the cover guy at ND, Cat is the pass rusher.
Bottom line, Teo didn't have to cover a lot of ground in the pass game, he had help and better guys around to help him out. Learned my lesson with Rolando, who looked like a good cover guy. In hindsight all Bama did was play man free and have Rolando rob/rat the middle of the field, he never had to go sideline to sideline with anyone. Saban knew how to use him, or rather, he had so much talent around him that he didn't need to do a whole lot.