So ironic how we find in some later sources were more accurate than earlier ones

"The actual fragments of the Presocratic thinkers are preserved as quotations in subsequent ancient authors, from Plato in the fourth century B.C. to Simplicius in the sixth century A.D., and even, in rare cases, to late Byzantine writers like John Tzetzes. The date of the source in which a quotation occurs is not, of course, a reliable guide to its accuracy. Thus Plato is notoriously lax in his quotations from all sources; he often mixes quotation with paraphrase, and his attitude to his predecessors is frequently not objective but humorous or ironical. The Neoplatonist Simplicius, on the other hand, who lived a whole millennium after the Presocratics, made long and evidently accurate quotations, in particular from Parmenides, Empedocles, Anaxagoras and Diogenes of Apollonia; not for the sake of literary embellishment, but because in his commentaries on the Physics and de caelo of Aristotle he found it necessary to expound Aristotle’s views on his predecessors by setting down their actual words. At times Simplicius did this at greater length than was essential because, as he tells us, a particular ancient work had become so rare." (from "The Presocratic Philosophers: A Critical History with a Selection of Texts" by "G. S. Kirk, J. E. Raven, M. Schofield").