To his credit if reports are to believe Allegri wanted complete squad overhaul after Cardiff.
It means he wanted to have a squad full of old experienced has been that would do part of his job for him to mask his deficiencies as a coach.
Allegri hasn't changed or improved his coaching style since then, let's be real here, there are system coaches even at amateur level, so for Allegri to be completely inept at implementing a system while being one of the highest paid coach in the world can only mean he is either simply not capable or he refuses to do so, either way don't make it looks any good on him.
Don't blame people who has started to think that Allegri chickened out from coaching Madrid and fleeced JJ to get his last big salary because he knew he would get exposed at other teams.
As a professional trained on the highest level and who is expected to compete on that level, it should not be excused that any coaches like Allegri couldn't implement any kind of system that can make a group of one of the highest paid athletes in the sports play their game decently and not looking worse than amateurs at their job.