It is important to remember that this is a rough sketch by which to write your essays. If your topic is quite complicated, then you may have infinitely more evidentiary paragraphs than three. Furthermore, you can expand your individual themes, as well. You can write two or three paragraphs in support of "theme 1" (or Body Paragraph One). The most important thing to remember here is consistency. If you have two or three paragraphs in support of one piece of evidence, then you should have the same amount of paragraphs in support of all sequential facts.
The third paragraph of the body should contain the weakest argument, weakest example, weakest illustration, or an obvious follow up to the second paragraph in the body. The first sentence of this paragraph should include the reverse hook which ties in with the transitional hook at the end of the second paragraph. The topic for this paragraph should be in the first or second sentence. This topic should relate to the thesis statement in the introductory paragraph. The last sentence in this paragraph should include a transitional concluding hook that signals the reader that this is the final major point being made in this paper. This hook also leads into the last, or concluding, paragraph.