I think Blackmon is a much better corner than Lane and probably Maxwell, but he looked iffy in special teams whereas Maxwell and especially Lane have been lights out in that regard. Seriously, I think Lane might be our best non-specialist (K/P/LS), non-Harvin special teams player. He's a pretty good KR and IMO our best kick coverage guy.
It wouldn't kill me if they released Lane, who I think is exploitable in coverage, but it would surprise me. Pete values STs a ton, and with Blackmon gone, I just don't see who we'd dump Lane for. I'm sure we'll keep six corners. Five would be pushing it given Thurmond's history and Winfield's age.
I feel a little sorry for Parker and Knox. I think our roster might be the only one in the NFL they can't make. Hopefully they get signed by another team, I'm guessing they will. If not, I hope we can PS Knox, who seems like a guy that could develop into something useful for us.