Disagreement about “from the Sunnah” does not concern whether Prophetic Sunnah carries legal authority. The issue is how confidently a Companion’s expression lacking an explicit personal attribution may be assigned to the Prophet ﷺ. The majority approach treats the unqualified phrase as strongly indicating Prophetic precedent.
Others preserve the possibility that “sunnah” could denote a recognized legal or communal practice, so they classify the wording more cautiously.
Example: Statements such as “It is from the Sunnah when marrying a virgin …” are discussed with attention to their speakers, context, and other routes. The terminological divergence is better understood as a disagreement about attribution and evidentiary inference than a dispute over a dictionary definition.