«فلا يعتبر بقول العوام والمتكلم والمحدث»
The book does not count the views of ordinary people, a theologian merely as a theologian, or a hadith specialist merely as a hadith specialist, for this particular juristic consensus.
This is a qualification test for legal reasoning, not a dismissal of those disciplines. A hadith expert may possess tremendous knowledge yet lack the specific competence for independent legal deduction.
One person may of course be both a hadith expert and a mujtahid; such a person counts by virtue of the latter qualification. Titles alone do not determine participation.