Testosterone cannot be used to argue whether someone is more male or female. It is known to exist in high quantities in males, and significant research has been done to associate high levels with male characteristics that associate with gender roles. This finding has been used to explain and even defend stereotypically male behaviour.
There is little, if any, research, however, in the dynamics of testosterone levels and female aggression. We therefore do not know enough about testosterone to conclude that it causes and drives male aggression. Aggression is simply classified as male behaviour and testosterone a male hormone. Testosterone therefore cannot be used to categorise individuals as male or female. 
Women who are athletic are associated with having higher levels of testosterone and therefore being more genetically male.
Testosterone levels can influence muscles, but this varies from person to person. Some people make better athletes with lower levels.