Ari, I can only speak for myself, but I don't think any of these essays are that formulaic. There's no right answer that will say, you should devote 200 words to this, 100 words to that, etc. Just answer their questions well, and get your story across.
The question is really straightforward. What are you goals, and why is a Tepper MBA going to help get you there?
My essay specifically has 378 words about why Tepper is the right place for me. I don't think you should worry about things like this. I didn't choose the length devoted to Tepper ahead of time; I wrote the essay that I thought best answers their question, and that part of my essay happened to be this length.