Coming off an injury, following a sub-par season, we're not going to get good value in a trade for Vilma. We also do not have a starting calibre ILB to put next to Harris, so we'd have to spend money on a FA or spend a draft pick to fill the void. Add to that the fact that Vilma and Harris did not see any significant playing time starting next to each other. Upgrade the NT position and start Robertson at DE. That will make a big enough front 3 that Vilma will rarely be worrying about shedding OL blocks.