Wagner made plays all over the field including behind the LOS. He was key in their run defense in taking on OL, A and B gap blitzes, sliding out to the rush off the edge, and would even slide out to cover slot receivers at times. He played everywhere and made plays everywhere. All you had to do was watch his game against Auburn and he jumped off the screen.
It's much more difficult to get an ROI out of the MLB position vs the RB position, BTW. It's basically a numbers game at that point. Not a lot of pure athletes at MLB that produce and RBs grow on a lot more trees. But I do get you're point about Turbin. Physically he's a top recruit and he's picked everything up as fast as you could want. Those two Utah St boys are weight room and track freaks. Also turns out they're pretty smart as well.
I'll be watching Kuechly pretty closely this next game. I thought he was highly overrated in the run game and made a ton of tackles downfield. Some of which were him trying to go around OL and giving up running lanes. In pass coverage he had no equal in college football. Top notch understanding of space, his role, and the role of the players around him from play to play. IMO, we can make some yards on cutbacks to the weakside running directly at him. If we can get an OL to get their hands on him then he can't play.