When the triumvirate was making a list of people to kill, Antony came across the name of his nephew. Even though it was his nephew that he was killing, Antony said, "He shall not live; look, with a spot I damn him." (IV.i.9) Antony had to kill his nephew, who might oppose him, and he did not want to take the chance. Another part where Antony's confidence in decision-making was when he was talking to Octavius about Lepidus. The triumvirate was made up of three people, Antony, Lepidus, and Octavius, and so "The threefold world divided, he should stand / One of the three to share it? (IV.i.14-15) Antony meant that Lepidus would not be capable of ruling a third of the world, and that he would rather take half and Octavius take the other half. Antony's confidence shows him being capable of being a great leader.
Along with being confident, Antony would make a great leader because of his nobility towards others. Antony was seen to be noble towards Caesar. The two men were close to each other