According to the theory, passengers were allowed to make calls, to get the official story out. Then "At about 10000 feet above sea level, remote controlled plastic explosives blew about 20 windows at once, balanced with 10 each side of the fuselage, so the plane would stay level, and equalize drag. This caused rushes of air to be released simultaneously and evenly, so the fuselage was not significantly damaged. This froze, asphyxiated and incapacitated the crew, passengers, and hijackers into unconsciousness."
I agree with your good point. The air release valve idea is too complicated and slow. Blowing the windows with plastic explosives would be much easier, faster, and effective.