Dragusin can’t play inverted right back where most of the time due to us dominating possession he would find himself in midfield. He’s a centre back and you’ll never see him play right back unless Ange went to a conventional 4 at the back which he will never do. Royal would play right back if Porro was out.It would work if he can play at right-back like he did at Sampdoria as well. What would you do if Porro isn't available (and Romero and Van de Ven are) ? I also believe that in certain games (or parts) Dragusin could play at right-back and Porro almost as a right-winger pumping in crosses.
Ange isn't gonna play with a back 3.