I read that article from Carlo Garganese on our most appreciated website! He's a bit retarded to be honest. Prandelli has played with 4-3-1-2 several times using Jovetic as a playmaker and it was a total success.
Though I agree that Spaletti's tactics and formation are ideal for Diego, however, Spaletti thinks football is all about attack. His defence was humiliated several times with 4,5,6 and 7 goals in a single match! since he took over roma's bench, his defence was a complete failure even in some matches where he won. His team just loves to concede goals easily.
Plus, Conte plays with a 4-4-2 or a 4-2-4.