Maybe the whistleblower is a composite—like the early girlfriends in Obama’s autobiography (actually biography, since it was likely written by Bill Ayers). In other words, a fiction.
That is not to say that if pressed, they won’t be able to find someone to act the role.
I have said that from the beginning. There is no whistleblower. The whistleblower is the imaginary friend of Adam Schiff. The entire thing is a fabrication.