TG
Agree with much of what you say but, unless I've misread Datcon's post, you've misunderstood a few points.
eg The aircraft was refuelled several times, but the tanks hadn't been filled for 14 flights. So the last time the actual qty of fuel on board was known for certain was 14 flights previously.
Also, when they were filled, the full quantity fuel on board (128 gals) was wrongly put in the Tech Log, not the usable fuel (123 gals) so everyone after that had been flying with 5 gals less than they thought. And that was before the rest of the errors crept in which made the true figure about 9 gals less than shown in the Tech Log.