This happens in the zombie sequence where the crux of the argument is largely 2 lines in http://lesswrong.com/lw/p8/zombie_responses/
“3. Intuitively, it sure seems like my inward awareness is causing my internal narrative to say certain things, and that my internal narrative can cause my lips to say certain things. [...]
(3) seems to me to have a rather high probability of being empirically true. Therefore I evaluate a high empirical probability that the zombie world is logically impossible.”
I think lines 1, 2, 4, 5, 6 are related to the argument but 3 and 7 are the “crux” of it. I mostly meant that there is a great deal of fluff surrounding the “core argument”, eg the other 5 articles in the zombie subsequence.