No. Great Managers are able to adapt to certain situations.
but not all stubborn managers are great
in my opinion i think a good manager is one who is stubborn with his view on footie bec he believes in it but in the same time has the flexibilty to bring about changes in tactics and formations as the need arises specially during games. thats sth we dont see with del neri or ranieri.
capello is a special case bec capello sets everything properly from the very start and lets not forget teh huge difference in squad quality between any of his squads and the current juve squad.
also lippi sure his second stint with the auzzuri was a night mare and he was not flexible at all and become more stubborn amidst pressure from the media over his call ups but still he was flexible in the sense he had a tactic and formation according to the scenerio the team is in.
thats what we really miss in this current juve, a manager who has a view about footie but also takes risks during games to bring about a positive result