Do you watch Justified? It's something that I really admire: the writing, the complexity of the characters and the acting.
If you get a chance, get Season 2: Disc 2 and after watching the story arc, check out the special feature called Clans, Fueds and Apple Pie. It is an exemplatory discussion on villains.
This isn't something that I'm capable of doing, but it is the level of complexity and riveting interaction that I'm striving to reach with my writing.
At one point, an actor or writer says, "I don't know where this character is going, but it is going to be exciting." they said it better. That's one reason that I don't think we can chart out where our villains are going in their journey, because we haven't seen how the plot is going to take them and how they might change as we take them through the story. I think we need to keep that sketchy, allowing them to evolve toward the end point.
It isn't that we can't chart out what that last climax is going to look like, but that how the characters act when they get there needs to be fluid enough to allow what we create to mature.
If you get a chnce to see it, let me know what you think.
Meg