Perdiccas was assassinated in Egypt after a failed river crossing left him open to a plot to assassinate him. Of course, only two days later, when Ptolemy had taken command of Perdiccas' troops (he had been in on the plot), news arrived of Eumenes' great victory where he personally killed Neoptolemus and where Craterus was also killed. As Diodorus put it, "had [the arrival of the news] happened two days before Perdiccas' death, no one would have dared lift a finger against him, because of the magnitude of his success"
As it was, the Macedonians declared the Greek Eunenes a traitor (of course with the urging of Ptolemy) and were condemned to be executed. But what if the news had arrived 2 days earlier and Perdiccas is a mr to use it as a lripaganda victory to his troops and not get assassinated? How does his war with Ptolemy play out, and the overarching successor wars?