The Jigsaw method is an interesting concept and in some ways is already utilized in allied health education, especially in the laboratory and clinical classrooms. Teamwork and direct participation is a requirement. For the lecture portion, I can see the technique being useful in breaking down several complex subjects and allowing the students to teach each other. A good example would be the various types of diets: low-fat, low-carb, diabetic, vegetarian, gluten-free, glycemic index, or Paleo, just to name a few. The students will learn the information, as well as how to research. They will also learn patient education skills.
A definite advantage of this technique allows the students to think for themselves, learn how to research and find reputable information, learn how to recognize a poor source of information, learn how to effectively communicate with their peers and future patients, as well as help them remember the information much longer.
A disadvantage involves the many different types of personalities. There will always be those who know-it-all, those who feel they should be in charge, bullies, wall-flowers, and on and on. It is ultimately the instructors responsibility to ensure that everyone works together. It is important for the instructor to establish guidelines and boundaries for all students.