"But to rise at the end of step one, if you are to follow the ISTD's own description of the beginning and end points of a step, you would have to begin rising before the moving foot passes the standing foot. This is much earlier than almost anybody would condone commencing foot rise. And so it is my conclusion that this discrepancy is an oversight by the ISTD. Maybe they were just trying to keep things simple, but what they forgot is that their book is scrutinized by the most analytical of minds, and discrepancies like these lead to more confusion."
Actually I think you will find that both Alex Moore, and a number of recent Blackpool champions, do teach precisely this. The rise occuring before the end of the step is not so much an altitude gain, but a timely completion of the specified footwork. Heel must become toe, which sends the hips forward of the legs to lead into the upswing. If the heel is kept down through the end of the step, then the action of step two will be incorrectly lead by the free toe, when it should be hip, toe catching up only at the moment step two is placed.