Gregg Popovich ruined basketball for a lot of Texans. That’s something you hear a lot when you talk about the legacy of the longtime Spurs coach, who announced this morning that he was stepping down from the head-coaching role he’d held for nearly thirty years. From Spurs fans, awash in whatever emotions they’re feeling right now, the reaction is something more like “thank you.” Thank you for the five championships, the 22 consecutive playoff seasons, the multiple conference finals appearances, the hilariously terse press conferences, the chance to celebrate icons unique to the NBA like David Robinson, Tim Duncan, Manu Ginóbili, and Tony Parker. The Spurs under Pop had a unique identity. They’re one of just a handful of pro franchises that represent their city alone—San…