ON SUNDAY, INSIDE a freshly built Spotify Camp Nou, José Mourinho will return to a familiar environment as his Real Madrid squad visit Barcelona. It’s a match worthy of multiple headlines where the story deepens when you expand it beyond what’s happening in the current standings of La Liga. I promise to get to that, but first let me explain this rivalry’s significance. El Clásico is more than just a match of contentious enemies. It is a fixture of global notoriety where opposing faces of Spanish football come together to deliver what is usually a thrilling encounter. El Clásico can’t fully be...