Not so important. So Complex. We know, definitively that Hussein actively supported, in material ways, Arafat, and the PLO. Both, Iraq, and the PLO were soviet client states once upon a time. So Hussein directly supported terrorism.
Going a step further, there are definitive links between several supposed Al Queda terrorists, and Occupied Kuwait, this also reeks of Husseini involvement.
The Possibility more than exists that Khalid Sheikh Mohammed, and Ramzi Yousef both were far closer to Secular Iraq, than Fundamentalist OBL. A quick glimpse at their personal habits as described my the media says as much.
If KSM was the operational commander and No.3 at AQ, and HE was linked to Iraq, via occupied Kuwait, and He is the Brother of Ramzi Yousefs mother, and we know that there was Iraqi involvement in WTC1, What does that say about Al Queda as constituted on 9/12/2001.