Well not entirely. Only three and a half JEdi figured it out: Yoda, OB1, Anakin and obviously QGJ, but we will never know if he could become visible as well. Yoda said he could teach OB1 to communicate with him, but all we know from canon sources is that Yoda could hear him.
Gl obviously didn't bother to tell what that was all about in his canon. So we don't really know.