None. They don't make Boston a contender, but will be good enough that the Celtics won't get the high lottery pick.
This offseason was about Howard and Williams. Howard is off the market and Williams isn't coming to Boston, so that means you don't waste the cap space. You just sign enough players to one year contracts to get to the minimum salary, but that won't make the team a contender, and hope the 2013 free agent class you can land a star to hopefully pair with your very high lottery pick and Rondo.