Slave vs. Master .... Who is who?

Throughout the Mary Shelley's Frankenstein, we see an ironic reversal of roles. The novel presents the motif of slave vs. master. Often, the reader has to ask himself who, Victor or the creature, is acting as which role. For instance, at the beginning of the novel, one can argue that Victor acted as the master, for he was very obviously in control of the creation process, and if not for him, the creature would not exist. On the other hand, one can also argue that Victor was a slave to his obsession with the creation. Here, we see the first instance of the creature controlling Victor.
As the story continues, however, the role reversal is more apparent. As the creature reaks havoc in the life of his creator, Victor most certainly falls slave to his creation. Worse than the simple fact of this reversal, however, is the creature's recognition of his control. "Slave, I before reasoned with you, but you have proved yourself unworthy of my condescension. Remember that I have power; you believe yourself miserable, but I can make you so wretched that the light of day will be hateful to you. You are my creator, but I am your master; --obey" (Shelley, 122)! The creature realizes that compared to Victor, he has nothing to lose in life. Thus, out of his bitterness, he feels no remorse in ruining the life of the one whom he blames to have made a miserable life for himself. Victor's agony epitomizes that control of his life that he has completely lost.