Yes he does, it’s called STAR in his defense. I just mentioned the term striker so it can be understood by people here.
I have studied Hetherman’s defense inside and out. He actually used two nickels one for coverage and the other in run support. If you watch the USC game, a more pass heavy team, you will see more of the traditional nickel but in the Penn State game, a more run heavy team he used the big nickel (Star)
See the image below #20 is Jeff Roberson he is 6-2 230 listed as LB on Minnesota official roster but he plays Star, nothing more than a big nickel or striker.
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Watch the way he is used against Penn State
Here is Hetherman using the more traditional nickel #24