Besides the fireworks at USATF Indoor Nationals (including 60-meter masters exhibitions and the son of masters runner Joan Hunter winning a national 2-mile title from the “slow” heat), the weekend brought news about a massive outdoor mile WR by a SoCal runner. Five years ago, I wrote: “M85 distance star Gunnar Linde, a Latvian-born former ski champion in Europe, now lives in Venice, California. He moved to the States in the early 1950s, so he’s a complete Yank. Sunday at the Southern California Indoor Meet … Outdoors (intended to give athletes a chance at distances contested at Boston indoor nationals),…