Answer. We can't really tell!
I think thats the problem - no-one, outside the Gulen organisation, really knows what his motives are. Saying that, we can make an educated guess given his close alliance with Erdogan over the years!
Until Erdogan and his cronies were outed as being corrupt money grabbing little men, they were as thick as thieves. Since then its been all out war between "the state" and the so called "parallel state" with, in many commentators eyes, "the state" being ahead on points as we stand.
The systematic purging of the judiciary, the Polis and the media has allowed Erdogan to pretty much do as he likes, without interference from anyone. Hence his anger when the supreme court went against his wishes and released the Hurriyet two. Incidentally, the owners of the Hurriyet, Dogan Media Group have been under attack from the government for the past few years - tax fines, trumped up charges of aiding terrorists etc. To quote one
publication "Erdogan reviles Dogan Media". Why? They're the last of the major media groups not under government control.
All his tactics have done is driven the supporters of Gulen under the radar - I suspect there is still a lot of support for him, it just cant be shown at present. I could be wrong, but my gut feeling is that he is a far more powerful individual (within Turkey) than a lot of folks think. Ironically, the biggest threat to the Gulenists isn't Erdogan but Gulen state of health. Without him as a figurehead I'm not sure how they will progress their cause.
Gulen comes across as a moderate - he has to else he'd be out on his ear from the US. But that then beggars the question, what exactly is a moderate (within Islam) when we're discussing the Turkey of today?
Not sure I know the answer to that one.
JF