Hhh..mm..mm two conflicting translations? What makes you think it is the second that is correct? My primitive Greek is insufficient. And if the latter is correct, could the report of Diyllos as given by Athenaeus be misreported - you seem to hint at that possibility yourself? This is all the more so, since as you observe, Diodorus XIX.52-53 has the restoration of Thebes occurring AFTER the burials:-Once again the curse of a loose translation, this one, the Loeb. is true to the Greek and clears up many of the problems that the previous one threw up as mere artefacts of the rendering of the Greek.....
Agesilaos wrote:After this, already conducting himself as a king in administering the affairs of the realm, he buried Eurydicê and Philip, the queen and king, and also Cynna, whom Alcetas had slain, in Aegae as was the royal custom.12 After honouring the dead with funeral games, he enrolled those of the Macedonians who were fit for military service, for he had decided to make a campaign into the Peloponnesus. 6 While Cassander was engaged with these matters, Polyperchon was being besieged in Azorius13 in Perrhaebia, but on hearing of the death of Olympias he finally, despairing of success in Macedonia, escaped from the city with a few followers. Leaving Thessaly and taking over the troops led by Aeacides,14 he withdrew into Aetolia, believing that he could wait there with greatest safety and observe the changes in the situation; for as it chanced he was on friendly terms with this people.
53 1 But Cassander, after assembling an adequate force, set out from Macedonia, desiring to drive Polyperchon's son Alexander from the Peloponnesus; for of those who opposed Cassander he alone was left with an army, and he had occupied strategically situated cities and districts. Cassander crossed Thessaly without loss, but when he found the pass at Thermopylae guarded by Aetolians, he with difficulty dislodged them and entered Boeotia. 2 Summoning from all sides those of the Thebans who survived, he undertook to re-establish Thebes,15 for he assumed that this was a most excellent opportunity to set up once more a city that had been widely known both for its achievements and for the myths that had been handed down about it; and he supposed that by this benevolent act he would acquire undying fame.
Xenophon wrote:Only three fragments of Diyllos survive so any comments about his reliability style etc are optimistic to say the least; Hammond 'Three Historians', even claims that he was fond of courtroom scenes, amazing since none of the fragments is a trial nor any of the terminology legalistic!
...because both used him as a seemingly reliable source. In fact Wachsmuth suggested that Diyllus was a main source ( since he too wrote a 'universal' history) for Diodorus....[Curt Wachsmuth, Ueber das Geschichtswerk des Sikelioten Diodorus, Vol. 2 (Leipzig, 1892)]Diyllus was reckoned a competent source and authority by Plutarch and Diodorus.
Perhaps Hammond was relying, like me, on the opinion of Plutarch and Diodorus, who clearly had access to the whole work presumably, rather than the three surviving fragments.....
But we digress. The fragment of Diyllus reported by Athenaeus you found is of great importance, for it re-inforces the slightly ambiguous report of Diodorus that the three were buried together in a single funeral...