If Ball did die as the result of pilot error, he wouldn't have been the first and definitely won't be the last. Another example might be
D'Urban Armstrong who was an "ace" Camel pilot - he was killed stunting three days after the Armistice.
I suppose, taken to extremes, the deaths of MvR and Mannock resulted from pilot error since both were killed when they ignored their own rules.
The French mademoiselle makes delightful reading (a la Lufbery)but I put as much store in that notion as I do the gunner in the church clocktower.
Since Ball fell behind the German lines, I presume there must be some record of his death in German records which might throw some light on exactly how he met his tragic and premature end.
VBR Graeme