Sorry Jim,
I meant to add in that no-one has ever suggested, including me, that every ballad that PB published was written by him or heavily overworked by him. The only difference between the 2 schools of thought is the extent to which he interfered with the material. I just happen to be at Child's end of the spectrum, but not for what I have read in Child, from my own extensive studies of all of PB's published works, the manuscripts, and correspondence between his contemporaries.