These companies appear, at least to me, as the pinnacle of "career as a creative artist in film" employers - I doubt the personality of a board member / part-owner, even one with as much going for him as Jobs did, was ever the deciding factor in their ability to lure talent.
Jobs was the main driver of the creation of the innovative-layout of the Pixar HQ building. Lassater himself said that he truly believed that the way the building was structured led to better collaboration and creativity -- ie. a better environment, which would drive more people.
It's not that people think, "Jobs is involved -- yay!" Rather it's the culture that Jobs helped create and helped nurture that people would find attractive. Many, many other leaders with different priorities would likely end up inadvertently squashing the open collaboration and creativity that made Pixar successful to begin with, rather than nurture it, preventing success and preventing new talent from choosing Pixar.