Further info from December 2004 from a message by Brice Clagett:
"The case for the Papworth Agnes man as the author includes his connection with the Welsh borders (which is consistent with an early reference to the author as belonging to that region), the lurid criminal record of Thomas of Newbold Revel, and the fact that one of the Papworth Malory's executors was a priest named Richard Ward who later served as literary executor of William Caxton, publisher of _Le Morte Darthur_. If Griffith is right, Thomas of Papworth was a protégé of his neighbor Anthony Wydeville, Lord Scales; acquired his knowledge of the French Arthurian romances from the Wydeville library inherited from John, Duke of Bedford, and was imprisoned and probably executed during the Kingmaker's brief seizure of power in 1469, having been knighted by Scales shortly before his death. The author was undoubtedly a knight, and the only arguable evidence that Thomas of Papworth held that rank is a Northamptonshire ipm of 1471/2.The identity of the subject of that ipm has beendisputed. Griffith presented a powerful case that it was Thomas of Papworth.Field has asserted perfunctorily that the ipm pertains to his man, but without coming to grips with Griffith's argument.Further analysis and a fresh view are needed.
I do not claim that it has been proved that Thomas of Papworth was the author. But it seems to me that enough doubt has been raised as to the Newbold Revel identification that a sketch in ODNB ought to give some recognition to a dispute that can fairly be characterized as unresolved.