I agree with you. But I consider Russia a very, very long shot. Assad or Iran for sure.
So maybe the big secret is that we were attacked by some third rate country or countries and don't want to admit that we got caught with our pants down due to the incompetence of our President and Secretary of State.
I like it.
And they possibly do not want people to know exactly which weapons were being smuggled to Al Qeada and the Muslim Brotherhood.