Use consistent terms. For example, you don't leave your driveway each morning in a car, drive to work in an automobile, and drive home in a motor vehicle. After you have introduced the person, pick one subsequent identifying shorthand term and stick with it. The court, the partner and your professor all want you to really use the case law. You must do both.
Transitions are the highest art of legal writing.
Experienced lawyers will tell you this. Consider how each paragraph flows into the next. If the transition from paragraph to paragraph reads abruptly to you, it will jar the reader, too. So consider making changes to your text that use transitions. There are law students and lawyers who are more analytically gifted than you.