Is the indication of ahad hadiths speculative or definitive?

The questioner : Is the indication of ahad hadiths speculative or definitive?

The Shaykh : Some of it is speculative and some is definitive, as the Shaykh al-Islam Ibn Taymiyyah explained in his books, and likewise Ibn al-Qayyim. Al-Hafiz Ibn Kathir summarized this in his abridgment on terminology titled "Abridgment of the Sciences of Hadith."
So, any hadith that the two Shaykhs included in their "Sahihayn" and which the Muslim community accepted without any criticism, even from those who did not act upon it but rather interpreted it figuratively; in this case, their agreement indicates that the Messenger (peace and blessings be upon him) certainly said the hadith. This is because they all agreed on its authenticity. Those who acted upon it are clear, and those who did not act upon it did not reject it by dismissing it, as some sometimes do, whether rightly or wrongly. Rather, they acknowledged its authenticity and interpreted it. Interpretation, as the scholars say, is a branch of authentication; interpretation is a branch of authentication... If they had a way to reject it regarding its authenticity, they would have been relieved of it and said: "This hadith is not authentic." The consensus of these and those, who are the Muslim community, on accepting this hadith as authentic provides certainty. So, if there is a corroborating circumstance with an ahad hadith, this circumstance elevates the proof of the hadith's existence from speculative certainty to definitive scientific certainty. Is that clear?
Fine.
Yes.