Sundance river analogy is bad. He should have mentioned the Rhine
The allies crossing the Rhine was a mark of victory in a war, a point from which victory was possible
Crossing the Rubicon was a political act of personal life or political death. Thee was no war involved.
Actually crossing the Rubicon was the start of a Roman civil war.
It thought the whole significance of Caesar crossing the Rubicon with his army was that it would start a war.