Originally Posted by
silvertate
If they had taken an uplift of drinks in Sharm, the crew would have counted all the drinks and should have spotted something like that.
Theory/guess, not fact:
Within that upload process a previous ISIS cell's scouting operation may have discovered a gap, vulnerability, or loophole which was then exploited.
Theory/guess, not fact
Basis of my speculation: 20+ years of receiving counterterrorism training.