My piddling observations on KA & KC. I would deem it an intermediate between a romance and a ballad. It is as Child states based on prose form romances themselves with some slight evidence of having been derived from something metrical, but not in Britain. Had Child had the full version he would probably have classified it with the several other romances given in PFM which he didn't include. However, in its favour it has some of the language and commonplace of the ballad, more than the usual romance. Against it it has too much going on and too many individual characters involved. Either way there is absolutely no evidence of oral tradition or continuance after 1640 other than being copied in anthologies.