As much as I'm a fan of the team game with everyone contributing on defense, and Kovy kind of goes against that, there are so few chances to get a player of his caliber. I really think that, as long as it won't cost us Parise in the long run, Lou should put every effort into keeping him.
Problem is, with Rolston and Pando on the books, it doesn't really seem possible. Pando can be buried, but I don't know if Lou would do that to him. Rolston could only leave if some GM out there owes Lou a favor and takes him in a trade.