DeMarcus Cousins isn’t expected to be the dominant center he was before an Achilles injury sidelined him for a year. The most that the Warriors can ask of him is to be at around 70-80% of his past form, and that alone should be enough to give opposing teams more things to think about (in addition to having to worry about the other four All-Stars).
Going by the history of previous players who have suffered the same injury and made their comebacks to the NBA, Cousins has a mountain to climb in terms of getting back to his peak All-Star form — assuming he does reach that level again in the future.