Couldn't the July 15 coup attempt be prevented?

In an indictment into the Fethullahist Terrorist Organization (FETÖ), three statements taken from the Second Chief of General Staff Yaşar Güler being regarded as a "victim" have been included. His first statement was taken on July 19, 2016 and its content was published on papers. 

However, we have learnt from the FETÖ indictment that he gave two more statements on Oct. 7, 2016 and Jan. 4, 2017. Thanks to these statements, for the first time we are hearing firsthand about certain and very important aspects regarding the coup attempt. 

Now, let us rewind the tape, based on these statements, to the afternoon of July 15, 2016.  

While an anti-terror meeting was ongoing at the General Staff's headquarters at 4:15 p.m., Güler left the meeting after he was informed that "the undersecretary of the National Intelligence Organization [MİT] wanted to task him." 

"I went to my office and spoke to MİT chief Hakan Fidan. He said an officer had come to MİT and told him 'very important things, I will now send my deputy Mr. Sabahattin to you to explain the details.' Sometime later, Mr. Sabahattin came," Güler stated. 

Mr. Sabahattin told the general: "A land forces major pilot visited us toward noon. He said, 'I was called from leave yesterday. I joined my unit. First, I met my battalion commander. Then a colonel told us to take our night vision goggles. He told us that we would have a night flight tonight and at the end of the flight, we would 'take' Hakan Fidan.' After this, Mr. Sabahattin left." 

Güler immediately went to see the Chief of General Staff and told him what Mr. Sabahattin had said. 

"I told him I regarded this as an important situation and we should call Hakan Fidan here immediately. Mr. Hakan was...