It's not that black and white, Mike. No pun intended there by the way !!
DD certainly takes his share of the blame for any shortfall in the Juventus quality of football, whether it is because of tactical or formation errors, lack of motivation, poor substitutions and so on. No one will deny that.
The difficulty is in determining the culpability of the players who might or might not be carrying out their instructions/responsibilties prooperly (marking/quality of passing/tracking back/finding space/making intelligent runs/shooting accuracy and so on).
Having been a football spectator for fifty years, I think I've now seen enough to realize that perhaps the one equation in football that has a much more powerful influence than any other is the manager/coach appointment. It is crucial.
Take Roy Keane at Sunderland. You knew, instinctively and intuitively, that he would be a complete success from day one when he took up the appointment at the Stadium of Light last year. Because he is a winner, you just know that he will be successful in helping to preserve the Premiership status at the club next season without any shadow of doubt. Indeed, I will predict that Sunderland will qualify for European football by the end of next season.
Does DD inspire you in the same way? Probably not.
Nevertheless, we have to look at the Juventus circumstances and accept that he inherited a terrible problem in the loss of eight experienced international players. He had to work with an unstable personnel against an uncertain financial background. Motivating Buffon, Trezeguet, Nedved and Camoranesi to play over 40 Serie B matches over 9 months must have taken an enormous physical and emotional strain whilst having to overcome the uncertainties of the ultimate points deduction and so on.
More recently, with the position much altered, esp. the financial picture seemingly much brighter and the club sitting on top of the league, you would expect us to win virtually every match, and rightly so as we have much superior players. Every now and again, we come unstuck at Mantova, Brescia and the like beacuse in addition to the Juventus match being their greatest match for , in some cases, decades (though not Brescia obviously) , they sometimes play with a tactical sharpness that will surprise even the best football brains. These things happen.
History tells you this.
The next two player acquisitions will be the most important announcments that the club will make for a long time and will have enormous medium term consequences on player morale, future qualification for the Champions League and more importantly an immediate sense of belief that we intend to be the pre-eminent club in Italy over the next decade.
All that said, I have a feeling that Didier Deschamps will be unhappy at the continued speculation about his mangerial effectiveness. The complaints seeming to be growing in number and I have a sneaking feeling that, born out of his bitter disappointment to the reaction to the relative success achieved this season, he might well be tewmpted to take flight to Olympic Lyonnais or Chelsea or the like sooner rather than later.