Someday, Joe Castiglione is going to write a book about OU’s move to the SEC. The secret meetings with Longhorns athletics director Chris Del Conte in the middle of nowhere Texas. The initial phone calls during the pandemic, and the conversations between he and SEC Commissioner Greg Sankey that led to Oklahoma entering the toughest conference collegiate athletics. But for Castiglione, Monday was not the day he was going to reveal those secrets. We will have to wait for his book release to know those. “You want me to reveal my book?” Castiglione said joking when asked about the ins and outs of …