The Miami Heat will go through the motions of a competition for their fifth starting spot during training camp.But one candidate enters with a fairly obvious advantage.Veteran sharpshooter Klay Thompson is the early front-runner to open the season as Miami’s starting shooting guard, according to the Miami Herald’s Anthony Chiang, giving coach Erik Spoelstra a proven floor-spacer alongside Giannis Antetokounmpo and Bam Adebayo.Miami signed Thomps…