Are Texas Monthly’s barbecue rankings fair? Can you compare a joint open just one day a week to places open six and seven? And a related, but more complicated fairness question: With so much of Texas Monthly’s overall business plan — events, tours, dinners, merchandise — now tied to barbecue, can the magazine look beyond its self interest when it comes to smoked meat? After gurgling below the surface since the release of the latest Top 50 list last month, these issues erupted into full view this week when Ronnie Killen went public to the Houston media. He later elaborated…