As the boxers make their way toward the ring, it all intensifies to a maddening crescendo that doesn’t stop. Mayweather’s business model closely resembles that of major music artists or groups. “They’re at the top of their artistry and craft, but they’re not content to develop that craft in isolation from other disciplines or indeed the world itself, and they’re modeling. or music. Maybe. Lentz closes, bellowing in a final…