It occurs to me that for the same reason they reject the idea of the Self, Buddhists need to reject the notion of a singular Dharma.
There is no Dharma. The dharma which can be articulated and exposited upon by thousands in a hundred universities is not The Dharma.
We posit a path, but this is not really a fully valid metaphor. There is merely always a next step which is slightly better, and one which is slightly worse. And with every step, the past fades, the ground disappears, and a next decision presents itself.