If they ask that since consensus is a valid proof for you only when the infallible is included, how would you know that his opinion is included amongst the opinion of the Ummah? We will answer that as Imam is one of the scholars of the Ummah, his opinion must be included amongst the opinions of scholars, for he cannot be a loner and manifesting infidelity, because that is not permissible for him. Therefore, his view has to be one of the views, even if we may not know which one is the Imam’s.