In fact, the true rhetoric of brand is the brand itself. It comes down to quality and value. In terms of product or service.
If your brand reputation is to rely on service, the first priority is make sure you deliver superior service.
If you do, marketing is a matter of exposure. If you don't, no amount of rhetoric is going to improve your reputation and create a value where there is none.
Brand is about differentiation. Brands come into being so an entity can be identified as something other than its competitors in the market.
Rhetoric is about persuasion.
A brand is a collection of symbols and contrivances that signify the brand as its own thing. This is also known as rhetoric.
For quality brands, brands that can achieve viability and sustain viability in the marketplace, the rhetoric cannot be separated from the brand. The rhetoric is the brand.