In the case of star players, two very important factors determine how that player is expected to perform.
Past success and the value of their contract.
Both serve to set an expectation for their on-field product. Each year there are those whose surprisingly stellar play increases their stardom and others who poor play questions their status as the game’s elite.
Both cases are rampant each baseball season. The 2015 season was no different.
For those star players that disappointed, the 2016 season allows them to start anew. A player may have recovered from injury this offseason.