Iger took his time to figure out who should replace Ross, because it's an unusual studio job. In addition to overseeing Disney's own productions, the job is about managing Disney's big divisions, including Pixar and Marvel, which are run by big personalities with a lot of experience-- John Lasseter and Ike Perlmutter. Plus there's DreamWorks Animation, run by Steven Spielberg and Stacey Snider. Running the studio means managing all those personalities, marketing spending, and release dates of movies.
At Warner Brothers Horn oversaw "Harry Potter," "The Dark Knight" and the "Oceans 11" trilogy. It makes sense that Iger would pick someone with expertise in big live action franchises-- with Lasseter he certainly doesn't need help with animation. And it also makes sense to pick someone who is such a longtime veteran of the industry.
If you're going to try to get people like Perlmutter, Spielberg and Lasseter to respect you, a long track record would certainly be helpful.
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