The light-heavyweight division was a bit of an anomaly in the UFC in recent years. Other divisions saw their title-holders have long reigns, while the light-heavyweight belt seemed to always be in flux due to the depth of depth of talent in this weight class.
Light heavyweight is in many ways the premier division. It's home to many of the sport's biggest stars, and for good reason. Lighter weight classes tend to have more action, but the fighters have less power. Heavyweights are stronger, but their size means that they get tired more easily.