By Joshua Mbu Matthew Slater, the recently retired star of the New England Patriots, has been given a new role as an advisor to the team. The 38-year-old is considered by the legendary former coach Bill Belichick as the best “core special teams player in NFL history.” The Patriots began their offseason program on Monday, marking a new era under Jerod Mayo, who took over from Belichick after a disappointing 2023 season. Despite retiring from the playing squad, Slater was seen back at the team facility, interacting with his old teammates. The news of his role was revealed by safety Jabrill Peppe…