Well, let's consider something; the grand-nephew of FS whose DNA was used is the grandson of one of FS half-siblings; They did not share the same mother. However, i was under the impression that the type of tests performed REQUIRED the two to share maternal ancestry? How, then, can this type of a test prove anything? And if this test was inncorrect, that kind of casts a shadow on the test proving AN and AA are not the same person...
IMO, the tests should be re-done; DNA testing has come far in the last decade, this time i don't think anyone will really be able to doubt the findings.