Is physical maturity (Bulugh) a prerequisite for the guardian's authority in marriage?

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Maturity is a required condition according to the apparent position of the madhhab. Imam Ahmad stated that a young boy should not contract a marriage until he has experienced a seminal emission (Ihtilam); he has no authority before that. This is the view of most scholars, including Al-Thawri, Al-Shafi'i, Ishaq, Ibn Al-Mundhir, and Abu Thawr. The rationale is that guardianship requires a complete state, as it involves enforcing dispositions concerning the rights of another person based on their welfare. Since the minor is subject to guardianship due to deficiency, he cannot hold guardianship, similar to a woman.