In other words ...

Since the only source who could leak the details of this investigation are military, it should be obvious that indeed he was captured.

That's a Guardian - sorry - RT - headline.  I'm not even going to bother to read it.  They're obviously going to put out whatever they want us to think.  Internal investigations are worthless.  You, however, can read it here.

...but hey, do what you want...you will anyway.