Usama made a severe tactical, and strategic errors.
2) it was a means of turning the less discerning against an ally when the nationality of the attackers was revealed;
Nothing for nothing, but some Americans have noticed a distinct shortage of humans from KSA.
3) Saudis actually had the sophistication necessary to pull off such an operation which required blending in and the study of technical knowledge.
If you say so. Our searches have only turned up two Pakis, three Persians, eight people claiming Jordinian Christian extraction. We did locate a Saudi national. He was with a white trash woman. His technical "expertise" did not extend to piggin. The general consensus is that sophistication is not their strong suit. And they cry a lot when a woman spanks their feet. We are still confused about this.
Osama's choice of Saudis was no mistake it worked very well for a while until voices of reason began to point out what was involved.
The rest of your post is meaningless to me.