Just Thomism: What is unique to and distinctive of man in St. Thomas’s ethics

Some notes:

Dominion sets man apart from brute beasts. Dominion is exercised through (the tools) of reason and will. Aquinas does use Aristotle's definition of man as rational animal. "Rationality" does not exclude rational appetite, or the will, but includes it. Both reason and will set men apart from animals, but it is the distinct form of agency proper to man, dominion, that is of interest in ethics, since ethics is concerned with human action. (With respect to Aquinas' (and Aristotle's) understanding of voluntary, 'voluntariness' is not enough to distinguish human agency from that of animals, even though "the voluntary in its perfection belongs to none but the rational nature."

What would the personalists add to this understanding of the distinctiveness of man? Does Aquinas's definition of person really satisfy them? Does personalism fail to pay sufficient attention to man's animality? Can an ethics be founded solely upon persons being relational beings by definition?