I am a non-native speaker applying next year. My question is rather about the topic selection: I think having a main target (either for it or against it) and presenting a clear argument is good for a writing sample. Is that right? And is it good to also refer to many related articles to show that I have a good command of the big picture and the specific topic? Specifically, I'm interested in justification-excuse, KK and norms of assertion in epistemology. So the question is rather this: should I show both a broad and a specific picture of these topics?