Not really. It's like saying Tito and Tata should have done as well as Pep with the team they had, but they really didn't nor did we play that well either...
Or that the reason for Chelsea sucking so much isn't Mourinho, partly atleast....
Or that SAF won the PL with a Man Utd team Moyes struggled so much with. And so on. This rhetoric sounds good, but it's as far away from reality as it can be.
You can have a great team, but with a bad or clueless coach, the team will never perform to its potential and most likely underperform heavily.
And considering Carlo has barely won any leagues in his long career, no league is probably weak enough for him to concede or fail to win the title.