In Julius Caesar, what is the purpose of picturing Octavius and Antony disagreeing about military strategy?act 5

Another way to understand this conflict is to see it in relation to their previous discussion concerning Lepidus in Act 4 and then in relation to the Brutus/Cassius conflict also in Act 4. Although Antony rouses he plebeians with rhetorical power after the assassination, we see a less attractive side of him when he and Octavius bargain over names on the death list and when he disparages Lepidus, both incidents suggesting he cherishes his own ambitions for political leadership over the good of Rome.  Also in Act 4, we see Brutus and Cassius argue, but they resolve their disagreements in a warm, very human way, and this resolution throws into relief the instability between the alliance of Antony and Octavius, causing us to see that Rome without Caesar might result only in confusion and uncertainty.  However, when the young Octavius overrules Antony in Act 5, we understand that he will become a good ruler for he appears just and strong, and his   decision to pardon and take into his service “all that served Brutus” confirms this, for he makes it independently and it is undisputed by Antony