I've heard the rumors too. Good luck to Dewitt in any case. That health struggle he went through sounds horrible, and I'm glad to hear he's getting back to health. A side note: check out his bio. His college degree is in physics and mathematics.
If he does go (and it's just a bunch of rumors at this point), some names that have come up are Mike Dawson (ex-Husker coach, and probably now an ex-New York Giants coach after their head coach got fired) and Mike Ekeler (another ex-Husker coach, who's coaching special teams at Kansas under Miles). Dawson was coaching OLB for the Giants, and he's likely looking for a job. Another ex-Husker coach in the NFL likely looking for employment is Doug Colman (recently of the Cleveland Browns), who has a lot of experience coaching special teams and of course he has experience coaching and playing LB. He also would have played with Frost at NU. And those are just a few names with Husker ties. If Scott does need to make a new coaching hire, he could just choose to open up the search and interview someone Husker fans have never heard of.