This is one of the more bizarre catches of the Mueller fishing expedition. It will likely turn out to be another dirty rubber boot.

Other sites say that Gulen was a moderate CIA "soft power" asset in Turkey and the moderate Muslim world and always has been.  The fact that Turkey has been cozying up to Russia recently (normalization, buying Russia's missile defense) means that they will be demonized in the western media. This could be the real agenda here.

I cannot believe that a former high ranking General like Flynn would not know all this. I expect this will turn out be very similar to the Don Jr. Russian lawyer meeting where a meeting was set up under a false pretext and the real agenda only came to light later.

All this based on FBI informants and investigators. The fate of the Newburgh Four comes immediately to mind.
https://en.wikipedia.org/wiki/2009_Bronx_terrorism_plot