What happens if Odenathus is more canny in his family politics and manages to avoid his OTL assassination in 267 CE? IIRC the assassin was motivated more by personal embarrassment after some insult at a banquet than by politics, thus, I think it unlikely that he would be the victim of a later assassination and could well live another 10-20 years. After his death Vaballathus, rather than Zenobia, will become the center of power, and said son will not have the same incentives to rebel that Zenobia did (he has a pretty comfortable position as Odenathus' lawful, recognized successor, after all). Thus the apex of the Crisis of the Third Cent. will play out very differently than OTL; Aurelian after defeating the Gallic Emperors will likely be able to campaign against Persia much more effectively. Does this change the overall balance of power in late antiquity? By how much? When/how might Rome end up divided/falling?