Wino,
You should think about what you are suggesting here. What MIGHT have happened was a result for moving from one sector frequency to another while taxiing around on the ground. What is the difference if it is at one arbitrary point or another on the ground.
My point is that if ground were controlling that ramp and taxiway in that particular area of the airfield, which is what would have happened in most other parts of the world, then there would have been a good chance that such an accident might have been mitigated.
This RAMP freq thing seems to be a peculiarly US phenomena that nobody else does, maybe for good reason.