Undermining this supposed uniformity between healing and teaching requires asking the question: what concretely changes for the mass of listeners?
An individual miracle does not guarantee a uniform understanding of a complex doctrinal teaching; without an explicit link, the audience may perceive it as a mere spectacle.
For example, the healing of a paralyzed merchant does not mean that everyone will instantly understand the subtleties of a new regulation on interest rates, even if the ability to act is demonstrated.
The real change only occurs if the behavior of the crowd or the cash flows of the market are directly affected by this association.