Erdogan would likely blame the Gulenists regardless. However it's not out of the question, either.

More importantly, there has been a significant shift in Turkey away from the US and NATO, and towards Russia. It's easy to see why. The US and its allies stoked the civil war in Syria, and that's been a costly disaster for Turkey. Now things are looking like the Syrian government will survive, while the Kurds in Syria have never looked better positioned to have their own de facto country on Turkey's border.

The USA harbours the Gulen and his followers. Turkey considers them terrorists. It's not hard to see why Turkey is swinging towards Russia and Iran.