I remember when it happened. March 2, when the Dallas Mavericks played the Los Angeles Lakers. That’s when I realized Luka Doncic was a top-5 player. But Sunday night, after Luka Magic’s Mavericks ran up a 47-point lead to dismiss the league-best Suns in Game 7 — in Phoenix — I realized top-5 might not do him justice. Doncic repeatedly sought LeBron James in pick-and-roll switches and attacked him time after time in the fourth quarter of that March game. It was similar to his all-out assault on the Suns on May 15 that began with 27 points in the first half. The Mavericks, who had blown a 21-po…