I'm sure some of them will be available late and for low price contracts.
However I do really like Josh Woods paired with Kyzir White at ILB. So I would definitely try and lock up Woods prior to FA opening up. Might as well lock up your special teamers (Gillikin, Brewer) while you can so that is one less thing to worry about. I also like Carlos Watkins as a rotational guy at DE even though we didn't get to see much of him due to the biceps injury.
The others that I have listed to keep (Fotu, Swaim, Strong, Ledbetter, Dorch, Mack) I wouldn't lose sleep over if they got picked up by another team but I would still try and sign them to start filling out the 90 man roster.