Eric,

Thanks as always...I think I've got it now. When there is debate it is about whether one or the other happened (either obtained or broke overlap).

So, in the case where they are debating if they obtained overlap, with any reasonable doubt, it should be assumed that the overlap was not obtained.

In the case where they are debating if they broke overlap before entering the zone, the assumption should be that they did not break overlap.

The takeaway you have while racing is, if you are not absolutely positive that you have established or broken overlap before the zone, assume that you have not and proceed with this in mind.