If nothing else, when Rockets coach Kevin McHale begins practice by calling over his starters, more than three players will head his way. The Rockets now have the two additions they pursued as soon as free agency began. With Tuesday's addition of Omer Asik, the restricted free-agent center whom general manager Daryl Morey began recruiting from the get-go, and the signing of point guard Jeremy Lin last week, the overhaul of the roster has brought the Rockets the type of young players at key positions they believe they can build around. "The two spots you really want to have settled on your roster are your one and your five, and we feel we have that settled for at least the next three years," Morey said. "We can build around the team."