The Boston Red Sox are the same as every other team in major league baseball when they scan to see who has been released or elected to become a free agent or an option has not been exercised. The items of note are the attention-getting impact players who can solidify a lineup, rotation or bullpen.
There is another level and that is players that can fill holes on your roster. They may not be the shining stars, but give competent support and represent a nice injection of talent. Certainly not stars, but worthy of filling out your roster.