Out all season with bad knees, Andrew Bynum’s latest setback may be the one that finally ends his year. Bynum acknowledged Friday for the first time that he may not play for the Philadelphia 76ers because of swelling in his right knee. Bynum experienced swelling in his right knee after five-on-five drills last week . . . The NBA received an official offer from 24 Hour Fitness founder Mark Mastrov and billionaire Ron Burkle to buy the Sacramento Kings and keep the team from moving to Seattle, the NBA announced. The Board of Governors is expected to vote by mid-April on the Seattle bid . . . Pamela Smith of Atlanta filed a lawsuit saying basketball Hall of Famer and Charlotte Bobcats owner Michael Jordan is the father of her teenage son.