Why did the brothers say “we are guilty” only when one brother was taken, and not when all of them were detained?

This source-based Torah study examines: Why did the brothers say “we are guilty” only when one brother was taken, and not when all of them were detained? It follows the canonical Hebrew discussion through the parasha and classical Jewish sources. This localized discovery layer is a concise summary rather than a full translation of the article; practical, halakhic, medical, legal, historical, mystical or empirical claims remain source-framed and subject to the canonical review status.