WEST PALM BEACH, Fla. — One morning in March, in the deepest back corner of the Washington Nationals’ spring training clubhouse, Juan Soto sat alone, holding a bat. And if the metaphor’s too subtle, consider that, in past years, as the wall clocks ticked past 8 a.m., Soto would have been surrounded by Trea Turner, Ryan Zimmerman, Adam Eaton and Howie Kendrick, allowing him to feel as though he’s still a rookie despite being the best on Earth at gaining the 90 feet between home and first.