Who says the CIA and NSA didn't discover the movement. We've heard that the stuff was moved, and that their were photos of the movement, for a good long time.
The difference here is that that the source is not some unnamed official, but rather a named individual within the government. IOW, a verifiable source.
Because John Shaw was working with Kerry on this, it was Kerry's October Surprise. Shaw was already under FBI corruption investigations and that is why he is a "former" member of the staff. Oh and his great evidence was "In my opinion...". Typical MSM crap that people keep repeating.