Looks like the Giants found their middle linebacker, though he's a little beat up with a lot of tread off the tires.
They worked out former Titans LB Keith Bulluck and apparently liked what they saw. Or at least liked him enough to sign him, perhaps as more of a stopgap in the middle while folks like rookie Phillip Dillard or Jonathan Goff develop. They're taking a chance, however, as Bulluck comes off ACL surgery after having his final year in Tennessee cut short after Game 10.
Don't quite have an idea of how this'll turn out. Bulluck is known as a pretty good locker room guy. His teammates loved him, so perhaps he can offer some short-term leadership. Best-case scenario, he comes all the way back and adds a solid middle linebacker for the next couple of years. But right now, he must be regarded as a short-term plug to a huge hole in the defense. Certainly worth the gamble.