Last year I only saw 3 gophers that consistently tackled at or below the waist, Stoudermire, Collado and Theret. Over and over I would see Gopher defenders come in shoulder pad height to make a tackle. The ball carrier would lower his shoulder before contact and the defender winds up being the one knocked off balance. The defender as he is falling grabs whatever he can to try and make the tackle. Many times last year it would be the runners face mask. My 11 year old has heard from his coaches for 3 years, "low man wins". It holds true at all levels. You have to bend your knees and at the waist to hit low and drive through the opponent--whether tackling or running.
I feel this defense has some speed and talent. With good coaching on tackling technique I hope to see major improvement on that side of the ball this season. I read that Coach Kill said each practice would have 40 minutes of blocking and tackling drills. That is great. You can scheme all you want, but when the guys get to the ball carrier they have to make the tackle or everything else is meaningless.