I think he would be awesome and I would love to have him on the team. I'm just not sure that we can afford him. After all the cuts and restructuring, the team is barely something like $2M under the cap right now. If they can make more room, I'd be all for an LB like Williams.
Also, I'm not sure, but isn't he a DE in a 4-3 and an OLB in a 3-4?