"Yet according to Wilson after his discussion with Nigerien officials such a transfer is impossible."
And Wilson believed them?
As I recall, this investigation began with a report of several hundred tons of yellowcake in a warehouse in Benin. If undocumented transfers are impossible, how did it get there?
That yellowcake was left over from the reactor the Isrealis took out in 1982 and was under UN seal. I've read you need a different grade of the stuff to make a nuclear bomb.