Leonardo Bonucci happily left Juventus to A.C Milan with no remorse, and even celebrated when he scored against Juventus. That aside, Leonardo Bonucci is already 31 years old and past his prime while on the other hand Mattia Caldara is a younger defender who proved his consistency at the highest level and is the future of Italy and accordingly should be the future of Juventus with the anticipated retirement of Andrea Barzagli and Giorgio Chiellini in the near future. Juventus must consider the future and maintain a younger average age of the squad. Mattia Caldara MUST remain at Juve and be given a chance to show his worth. He's an exceptional defender and has a lot of years to give at the highest level.