 The role of Theodoret as a source for Aëtius has been questioned and doubted by Lebedev 1983, Frede 1999, Gourinat 2011, and Bottler (2015). However, no one doubts that there must be a source PS shared by ps.Plutarch and Stobaeus. One can also prove that there must be such a source (TS) shared by Theodoret and Stobaeus. As a final step one can prove that the PS source and the TS source cannot be distinguished from each other so are identical. Thus Diels’ original intuition is vindicated. For details see Mansfeld 2018 and section 8 below.