I think we've got 2 keepers at LB, and Hewitt is one of them. Unfortunately the other one is Kiko and his best fit is also probably at WILL. Hewitt is key depth and should get plenty of work in subpackages. In a perfect world we nab a MLB next draft, kicking Kiko over to WILL, with Hewitt as his backup. He's valuable depth. Then get a bull who can stand up at POA for SOLB, those guys usually aren't too hard to come by. Paysinger is good depth behind whoever that is too. So add a starter at MLB and SLB. Worse case scenario, Kiko is still solid in the middle, Hewitt could be an average starter at WILL, then you just need to build the depth behind them. Definitely need to add a blue-chipper to the mix though, whether at MIKE or WILL, then slide Kiko to the other spot because he's key.
What about stealing Hightower from the Pats? Spotrac has set his value at 5/50.5M.