Based on what? As horrific as it might be it wouldn't surprise me if passengers were conscious all the way down. Even if oxygen masks didn't deploy or work, at 26,000 feet you have a few minutes of useful consciousness after rapid decompression [1]. Combined with the fact that the plane would be rapidly descending.
Nonsense. G forces are changes in speed or direction, those were pretty mild based on what we know right now, freefall or powered flight into terrain does not give huge G forces until impact.
5g forces on impact would imply the projectile stopped at ~50m/s^2 (numerically 5x the gravitational constant) deceleration. In a free fall, it hardly exceeds 1g, unless the aircraft was powering it to hurtle down faster
1: https://en.wikipedia.org/wiki/Time_of_useful_consciousness