Ben Gordon was once the linchpin of the Detroit Pistons’ rebuilding plan after their long run of Eastern Conference finals appearances ended. He turned out to be such a bad signing – OK, not as bad as Charlie Villanueva that same summer of 2009 – that Joe Dumars had to sacrifice a future No. 1 pick just to get rid of him. The Pistons traded Gordon to the Charlotte Bobcats on Tuesday for Corey Maggette, another free agent bust from a couple