I believe there were already people saying that Turkey shouldn't have been part of NATO. It just don't share the same values (probably same reason it can't get in the EU).
Do I think he's ambitious? Yes and that might cause trouble. Would I blame him for "diversifying"? No. The modern West is more an anomaly IMHO. Civilizations primarily looking out for themselves was the norm.
After reading all these information i dont think that gulen is beneficial.
Providing free education is good but they surely do that in order to create a propaganda scheme and educate people based on their own beliefs and benefits.
Education has always been propaganda, whether it is controlled by religious orders like in the past (and still today in some countries) or by secular governments. I don't know whether what the Turkish government accuse Gulen is true or not but either way, it was a battle over spreading their preferred propaganda.
Right now, Turkey is the worst member of NATO in terms of not offering anything to the alliance.
Probably they let Turkey be a member so they won't be in close relationship with Russia. But as the events show, Turkey's participation in Nato didn't stop them of making deals with Russia. And to be clear, I don't have anything with Russia. Turkey is the double face problem in the South Eastern Europe.