Would it be more effective to use rhetorical devices that support a general idea/purpose of the writing when creating paragraphs, or to group the paragraphs by specific rhetorical devices?
It is more effective to use rhetorical devices that support a general idea or purpose. Typically, I have my students break the passage into chunks. For each body paragraph, the topic sentence is a claim statement of what the general purpose of that chunk is. Then as they segue into evidence, they use the devices within that portion that justify that claim.