A year ago in spring training, Jason Varitek was tearing up at his JetBlue Park retirement ceremony. Both he and the Red Sox were confronting the reality that for the first time in 16 years, Varitek would not be catching for the team. And even though Varitek’s prime was several years earlier, the captain left behind a legacy that most did not see anyone being able to replicate any time soon. It was a sad, sobering moment for the team, but even though the Sox still have not found the perfect person to fill Varitek’s shoes a year after his departure, they are getting much closer. The five catchers in camp — Jarrod Saltalamacchia, David Ross, Ryan Lavarnway, Daniel Butler and Christian Vazquez — all are impressive in their own right. Together, they give the team great flexibility at a position where depth is scarce these days. “We have a pretty special group here. The five guys here in camp are pretty talented in their own right,’’ bullpen coach and catching instructor Dana Levangie said recently.