والمعتبر في هذا الباب إجماع أهل الرأي والاجتهاد
What is relevant here is the agreement of those competent in legal reasoning and independent juristic inquiry.
Fame, general learning, or the number of people expressing an opinion is not enough. Consensus on a derived legal ruling requires ability to understand the legal sources, their indications, and methods of inference. The agreement of laypeople, or someone without insight into legal principles, does not itself constitute this technical consensus.
This does not diminish expertise in other disciplines. The point is that the evidentiary authority of legal consensus depends on appropriate juristic competence.