I disagree that these attacks were ‘brilliant’. Three simultaneous attacks against large groups of unarmed people did not require genius. One of the attackers still was carrying his passport, making his identification and backtracking to his support much quicker. Removing manufacturers tags from their clothing, obscuring serial numbers on their weapons and carrying no identification would have been more professional. True, they want ultimate credit for the organization, but wiping their tracks from their sources would make their methods and means less discernible.
Yes, and the truth is scarier than the “brilliant” fiction: a handful of morons can kill and injure hundreds of people in a few minutes, using simple means. It takes no special genius to say, “everyone attack at 7:30PM” or to devise a plan like: “go to a place with lots of unarmed sheep in a pen and mow them down.” The simpler and more random the plan, the harder to predict and stop it.