Let's say just for funsies:
The Devils send Philadelphia Yegor Sharangovich for Krug at 40% retained. Krug would then have 4 years left at $3.9m as a 2nd/3rd pairing LD.
Devils roll out
Hughes-Marino
Siegenthaler-Hamilton
Krug-Nemec
As their defensive lines for the next 4 seasons. I don't despise it. Krug has 57 points in 82 career playoff games, he's obviously a gamer. He eats a ton of minutes, he's a PP2 QB.
EDIT: obviously it's unlikely that Philly retains for that many years, and obviously Krug is untouchably repulsive at his full cap hit for his age 32-36 seasons. Just drunk and rambling.