I am sorry Raptor22 but the list of foreign fighters that you have provided is pure nonsense. There are no more than 2500 Saudi Arabian fighting in both Iraq and Syria. Those are numbers from the state and independent sources.
"More than 2,000 Saudi nationals are estimated to have joined the ranks of IS, bringing with them an extreme brand of "takfiri" ideology that views large portions of the population with suspicion and intolerance."
BBC News - Islamic State sets sights on Saudi Arabia
The article is from 14 November 2014. So unless 5000 (!) have joined Daesh in less than 2 months then that source is pure bogus.
Still 2500 too many although they make up less than 0,007% of the total population of KSA. Most that have joined reject everything that KSA stands for and most have burned their passports which there are tons of videos of. Let all those lunatics join Daesh and get killed abroad. Would be a good thing. Otherwise they are difficult to identify.
Most of the Deash foot-soldiers are local Syrians and Iraqis as are the leaderships in their entirety. Foreigners are used as foot soldiers.
Precisely. No need to look out for conspiracy theories everywhere. It's a favorite pastime of the ME. No wonder that people are easily fooled by their respective regimes.