I'm really questioning the primary returns at GIVAL and IGREX
you have right to question anything you want, nothing is 100% official appart from disappearing of this plane.
But I think you have to be reasonable. Every piece of info, every map analyzing possible tracks shows all tracks converging at IGREX, this seems to be an undisputed origination point for the tracks heading South. I haven't seen any mention that it could still be disputed.