um...
you could talk about how caesars real power was not obvious in the triumvirate, on the surface it appears that they were all on equal footing, but throughout the play we can see caesar through his devious ways, works with powerplay, to bring down the power of antony and lepidus, and elevate his own....
use examples throughout the play, chuck in some techniques
um you could even talk about the power of cleopatra, how her real power in the relationship (antony and cleopatra) is not obvious on the surfac ,e but as the play progresses we can see how cleopatra tries to manipulate antony through her sexual power, and bring him down....
stuff like that