The Sharks have been almost invisible in the free agent market so far, even though they have let enough players go to create some cap room. With many of the top free agents signed, the pickings left for General Manager Doug Wilson are slim.For that reason, I expect the focus of the remainder of the summer to be on trades, covered in my next article. However, as of Tuesday afternoon, there are still some free agents the Sharks could add to improve the team. In order to determine the best choic...