Exactly he isnt any worse than Molinaro defensively and offer more offensively,
since we didnt get Grosso, thats our best option there.
DC is still young and weak, i agree he gets outmuscled but you should also consider that he involves to our defensive game more than Molinaro, DC at least tries even if he might fail at the end where Molinaro dont even try to interecept,
DC will learn how to effective and succesfully intercept players when he will have Molinaros playing time and grow a bit stronger, where Molinaro will always be hopeless!