Leadership Style And Job Satisfaction

I am writing a thesis about the relationship between leadership style and job satisfaction. However, when I propose this idea to my instructor, he said that:
-The frontier among leadership style is blur, i. g. a leader may be half of transformational and half of laisse-faire style
-If we measure the correlative between leadership style and job satisfaction, it's a very difficult task too. Because we may be satisfied with the job, but we hate the boss, but in general, we are satisfied. Or, during the survey, we can meet someones who have a transformational-style boss, transactional-style boss and lasse-faire boss, and they all he hates their bosses whatever the style may be;
Do appreciate if you could give me some recommendations over this

Your supervisor/guide is right. Leadership is only one of the variables that affects job satisfaction. Please see Emerald | Leadership in Health Services | A study of relationship between managers' leadership style and employees' job satisfaction found at Google
A number of full papers are available to download on page 2 of Google above.
Have a nice day
Simhan
A retired academic in the UK

I believe the correlation would be stronger on the long-term, so if you are willing to do your study for a period greater than two average life spans of employees, you might get better results.