I’m taller than the average Olympic gymnast. Does that make me tall? Likewise I’m shorter than the average NBA center. Does that make me short? The answer to both questions, of course, is no. “Taller” and “shorter” are comparative statements. They say something about my height compared to certain others, but only by comparison. “Tall” and “short” are absolute statements.
Comparative statements do not prove absolute statements. Absolute statements do not prove comparative statements. The LSAT tests the distinction between them quite often, in a few ways.