Dont like to admit it, but Napoli is doing completely right, and will highlight what pathetic idiots inter were, with the same coach.
2010/2011 inter : coach leaves, teams stays. new coach benitez doesnt get the new players he wants, and is stuck with players that he cannot use in his succesfull playstyles and formations. Inter start their decent that as of today, is still ongoing.
Napoli : sells cavani, gets alot of cash. excellent time to swap coaches cause need a new system as there isnt a "new cavani". Benitez comes and can now get 1 or 2 players to his liking, and unlike at inter, can now actually create a team like he wants it.
Napoli will lose in quality, but they'll be very strong again, with the replacements that all that cavani money buys.
Milan ? depends on their mercato. Ogbonna+hernanes and they'll look scary as fuck