[Allan]

However, it's hard to see how one can reach a conclusion about a possible proxy from that.

You are right.
Saddam could have hired him to produce and distribute the 'gold standard' anthrax.
Or the Martians could have done it too.

[Mitchell]

Well, that's not what I meant.

Someone who already had access could conceivably have sold out to the highest bidder, for instance. Such a person would probably not have provided production details, thus giving Saddam no long-term WMD capability, just one-shots.

But I don't think this is at all likely.