Quite frankly a lot of folkstyle wrestlers peak around their redshirt soph year or so, then they are at the same level the rest of their career. Scouting is a huge factor in that, people know your best moves in neutral and from top and avoid those. After that it's better TD defense and ability to ride for those wrestlers, you can list dozen of AAs in a similar boat this year if being honest.
Fix isn't alone in that regard, though I'd say he definitely got better on top later on in his career.