Could you explain exactly what an Editorial Director does? Where does she fit in with the general hierarchy of a publishing company? (I assume she is more senior than a Senior Editor, but is there anyone more senior than her?) Does an Editorial Director have to go through a committee to acquire, just like everyone else, or is she more autonomous?Ha-ha! I will never tell. The industry is conspiring against you to make this information inaccessible!
Ok, I don't mean that. But I can't tell you the answer, because what an editorial director does, how she fits in the hierarchy of the company, and how she acquires will vary unpredictably from one house to another.
So if I told you what "editorial director" means at my house, my colleagues might be able to figure out which house I work for. Every company uses titles to suit their specific needs and interprets titles according to bureaucratic whim. There's no communal chart for what a particular title means in publishing.
Perhaps some of my publishing readers could give anonymous examples in the comments of what "editorial director" means at their houses.