Mariners president of baseball operations Jerry Dipoto presented a historical perspective around the development of second baseman Cole Young. “To get to the level he did at the age he did … those players generally stay around a long time,” Dipoto said recently. “Those are guys that you look up and they had 10-, 12-, 15-year careers and did really special things. And I think we’re going to look up and that’s what it’s going to be for Cole.” It’s starting to happen already. A year after making his MLB debut as a 21-year-old, Young is making a case as the best second baseman in baseball through the first month of this season. Benched as a rookie at the end of last season, Young has emerged as the most intriguing early-season development for the Mariners. Since Robinson Cano’s final season in 2018, the Mariners have had a different starting second baseman on opening day for each of the past nine seasons. It appears they have their long-sought answer for a long-term solution at second base.…