My interpretation of a traditional singer, as I have explained previously, is based on the context in which he developed his music. That's not to say that all his songs must come from the same context, that, or they must all be traditional songs, or that he can't create his own.

By my understanding, Fred Jordan was a traditional singer because of the context in which he learned to sing and acquired many of his songs. It makes no difference whether he learned some songs from other singers in the same context or from Martin Carthy. It makes no difference whether he subsequently performed in the folk revival - that was not his original context, and it was not that which formed his singing (although it may have influenced it, if only by exposing him to new material).

On the other hand, my own context is that of the folk revival. I am not and never will be a traditional singer, although I sing traditional songs, and it makes no difference whether I learned a song from Martin Carthy or Fred Jordan.