The free agent nobody is talking about: Brandon Moore
Moore has been a rock at RG over the years. He seems like the kind of player we won't miss until he's actually gone. Without him to run behind it'll leave a gaping hole at RG and we will have o-line problems (especially if they try to replace Slauson with Ducasse). Not to mention inexperience at the guard position will put even more pressure on Austin Howard, who may not be ready to handle it.
Everyone is talking about the skill positions on offense (and rightly so), but it seems the o-line will also be a weak link next season as well. Could be a loooong year.
Moore is the kind of player who could sign with a good team that is trying to plug in the last couple of missing pieces for a championship run.