It's probably because when Scruggs does get a sack he smacks the shit out of people while doing it. Players that flash dominance are worth keeping an eye on.
And I know this sounds like a huge reach, but there were some cutaways of the Seahawks for various playoff promos, and a couple of them featured #98 shouting and trying to pump up his team. He looked like a guy that genuinely had "it" mentally. His body language most definitely did not look like a kid under the lights for the first time. I have a hunch he's going to be the next Michael Bennett if the coaching staff gives him more opportunities next year.
It's not a reach at all. Follow his twitter; he's got a very Sherm, Red, Earl type vibe to him.