I'm not getting the Mathews man crush.
He played in 13 games and had just 56 tackles, and 4.5 sacks.
It doesn't seem to me that he really does anything well, just a lot of things ok. He has just decent straight line speed, and below average athleticism. He isn't very agile, and struggles in coverage. He lacks ball skills. People are calling him an overachiever. If 56 tackles is overachieving... yikes.
For him to utilize his strengths their max potential he will need to play as a 3-4 linebacker. Preferably in a scheme that doesn't ask him to cover anybody 1-on-1.
The only thing he really does well is try hard. That's just not good enough to be a first round pick.