NEW YORK — The Guardians’ bullpen has concocted the proper formula, crunched the numbers and observed enough trials to create a foolproof advanced metric.It’s called xDAWG.It carries the spirit of other expected statistics (represented by the X) that forecast a player’s performance based on a variety of inputs. This new metric measures whether a player possesses the grit and fearlessness required to deliver in a pressure-packed, high-stakes moment.Surprisingly, it’s a rookie, Cleveland’s relievers calculated, who sits atop the xDAWG leaderboard. It’s a rookie with a 2.21 ERA. It’s a rookie who, for a few starts, has admitted to lacking his top-level stuff, yet has nonetheless continued to quiet opposing bats.Parker Messick is no ordinary rookie, though. Neither is Chase DeLauter or Travis Bazzana. The three might lack in experience, but they have delivered a steady dose of plate discipline, timely hitting and, well, xDAWG.The Guardians are once again in first place, charging toward a third consecutive AL Central title, and a prevailing reason is the trio of rookies cosplaying as polished veterans.It spurred reliever Erik Sabrowski to raise a pertinent question: “Can we just give the Rookie of the Year (award) to a team?”“We’re all going through a lot of early learning as rookies,” Bazzana said. “To look on the bus at the guy next to you and be like, ‘We’re in the same boat and we’re going to be doing this together for a while,’ it’s a good feeling.”The Guardians trusted DeLauter to debut in a playoff elimination game at a position he hadn’t patrolled in a year and after three months of being sidelined by injury. Everything after that experience, DeLauter said about his whirlwind experience last October, should feel simple, such as starting for the Guardians on Opening Day, or batting in front of and then directly behind José Ramírez.DeLauter embarked on a historic home run binge the first week of the season, carrying the lineup through a daunting opening trip to Seattle and Los Angeles. He became the second player in major-league history with four homers in his first three regular-season games. Since then, he’s solidified himself as a middle-of-the-order threat.