Saddam was not counting on being invaded, merely needing to "concede" to UN inspections. He moved his WMD's to avoid their discovery by UN inspectors.
Does that sound plausible to you?
Again, Saddam was being invaded by his mortal enemy, the enemy whom was in imminent danger of being attacked with his WMD's, and he did not use them. He moved them and hid them so brilliantly that he left no trace or witness of them being moved. You give Hussein too much credit. Still doesn't sound plausible to me.