The Warriors have been very good since acquiring six-time NBA All-Star Jimmy Butler before last February’s trade deadline.Yet longtime sports personality Colin Cowherd believes Golden State should blow it up with a trade that would turn the league on its head.“Jimmy Butler’s a fling,” Cowherd said Thursday on his show, “The Herd.” “He’s not a phase. And I think it’s time for the fling — at the trade deadline — to end. And I love Jimmy Butler. But Steve Kerr is too smart to think that 37-year-old Steph [Curry], 35-year-old Draymond [Green], 36-year-old Jimmy Butler, and now 39-year-old Al Horford can compete in the West. They can’t.”“I would trade Jimmy Butler, Jonathan Kuminga, and four first-round picks for Giannis [Antetokounmpo] and see if it’s enough. Jimmy Butler played at Marquette; so, he’s coming home, and he’s still a lethal free-throw shooter — big-game performer. Jonathan Kuminga averaged 20 [points] a game last year when he didn’t play with Steph. They don’t work that well together. Although when he...