I've always found Timmerman and Insight to be very credible.
I have also found Timmerman to credible in the past.
On the thread that was discussing this last week I posted:
Ahmed Chalabi has a history of working with Iranian intelligence. CIA agent Bob Baer was nearly crucified by the FBI in the mid 1990s after a cable was intercepted describing a plot to overthrow Sadam. The intercept was of an intelligence debrief of Chalabi by Iranian intelligence. Chalabi told them that a CIA agent named Bob something was in Iraq to overthrow Sadam.
Baer was in Kurdish controlled Iraq working with the Patriotic Union of Kurdistan (PUK)and was recalled to Washington at the insistence of Tony Lake. Lake was concerned that there was a rogue operation going on.
I highly recommend Baer's book "See No Evil" if you are interested in terrorism and the middle east.
P.S. Thank God, Lake was not confirmed as Clinton's choice for CIA Director in 1996.