When a narrator whose identity is unknown is found in one chain of transmission, and a narrator whose identity is unknown is found in another chain, does one strengthen the other?

The questioner : You mentioned, O our Shaykh, a narrator whose identity is unknown with a narrator whose identity is unknown, and you graded it as good.

The Shaykh : What does that mean?

The questioner : A narrator whose identity is unknown and a narrator whose identity is unknown.

The questioner : In the same position.

The questioner : No, a narrator whose identity is unknown and a narrator whose identity is unknown. I wrote the message first, but I made a mistake; it is not "very weak," but rather "weak." So, if a weak hadith is strengthened by a narrator whose identity is unknown from another route...

The Shaykh : No problem, but you are saying a narrator whose identity is unknown and a narrator whose identity is unknown; what does that mean?

The questioner : It means a hadith that came from... from two routes where the narrator is unknown in both...

The Shaykh : If the unknown narrator in both chains is in the same generation, then one does not strengthen the other. Do you understand this?

The questioner : Yes, I understand.

The Shaykh : Now, if the unknown narrators are in different generations, for example, if the unknown man is the Shaykh of the author in one route, and in another route the unknown one is a Tabi'i (successor), then it becomes clear to the researcher that the unknown narrators here are not in the same generation. The reason I mention this distinction is that if the unknown narrator in both routes is in the same generation, it is possible that the unknown narrator is the same person, and in that case, it is not permissible to strengthen something with itself. However, when the unknown narrators are in two different generations, as I explained just now, then it can be said that the hadith is strengthened by the combination of two chains with unknown narrators.