It's not really that you can jump from say, group 3 to group 4. What is really happening is someone who is transexual, who was born that way, will mistakenly identify themselves as a cross dresser or other form of transgender. They just aren't being totally honest with themselves or are ill-informed.
I thought I was a cross dresser for a number of years while I really was transsexual all along. I also thought I liked women, even though I had been with men and had no desire to be with women.
It's funny how the mind works, and how you can keep secrets from yourself.