https://classic.7sage.com/lsat_explanations/lsat-57-section-3-question-21/

https://classic.7sage.com/lsat_explanations/lsat-70-section-1-question-17/

can anyone explain why JY labels the first sentence in question 21 [the first link] a phenomenon and not a conclusion, but the first sentence in 17 [the second link] the overall conclusion. what's the functional difference in those sentences?