The chant began as a disorganized rumble. As the Chicago Bulls led by 14 points in the waning minutes of Friday’s game against the Charlotte Hornets, clusters of fans scattered throughout the United Center started to strike on the same idea. “We want Taj. We want Taj. We want Taj.” Taj Gibson had waited patiently on the Hornets bench for the entire game. It was to be expected. His starting days are long gone. The forward averages fewer than 12 minutes per game in his 16th NBA season. It had been a long time and a long way since the days when he ignited playoff dreams on this same court.