ثم الإجماع على أحد أقوال السلف.
Finally, consensus may arise around one of the positions held by the predecessors.
Earlier scholars may have held several legitimate positions on a problem. Later qualified jurists may converge upon one of those recognized alternatives. That is the fourth form.
The earlier difference is not rewritten out of history. Rather, later agreement selects one previously existing view, instead of inventing a new third position.