This is just my own idea, so feel free to fix it if you don't think it's applicable

. First, it depends on how you define "powerful" and "powerless". Whether you think Fowler is the most powerful or not, it depends on different interpretations. One can say that Fowler's motive in killing Pyle is purely self beneficial since he envies with him and desires to repossess Phuong. so maybe Pyle is the powerless here. At the same time, one can argue that Pyle is in fact the powerful, he treats people's life as a sacrifice to Democracy and believes that this is for the better. Now I guess we can discuss a bit about Phuong, she is somewhat a very mysterious character in this novel. Until the end, we are still unsure whether she is the powerful or the powerless. She is somewhat acquiescent and relies on both Fowler and Pyle's support to survive through the austere environment of war. Yet despite such fragile appearance, she is the only character who "rises from the ashes" and still remains somewhat unaware of the evil behind the colonial oppression she's living in . If you support the idea that Phuong is a powerless who ultimately uses the powerful to advance her desire of maintaining security, you can probably explore the prompt from a different perspectives. Hopefully it helps

!. Sorry if there is any wording issues.