The Boston Celtics will have a battle for their starting center this fall. Mass Live Celtics writer Brian Robb on Friday laid out in his mailbag what he thinks the big man rotation will be. “My bet would be on Queta as a starter, with Boucher and Garza getting regular minutes,” Robb wrote. He also averaged just 12.2 minutes per game, a number that is likely to increase if he becomes the starting center. Story continues below advertisementWhoever starts at center between Queta, Boucher and Garza will have big shoes to fill, replacing Al Horford and Kristaps Porzingis, who held down the position the last two years.