Even the fact that they will only play the championship will be a big advantage for them, if we look at the statistics, Inter this season between the championship, Italian Cup, Italian Super Cup, Champions League and Club World Cup has played 62 matches, against Napoli's 41 who won the championship. So the fact that they don't play in Europe could give them a big advantage
It will be interesting to see how Massimiliano Allegri will deal with Massimiliano Allegri. I said last season that Milan's biggest problem was in defense, in attack they were fine. The thing is that Massimiliano Allegri is an expert in defending, so if he can strengthen Milan's defense and keep Milan's attack strong then I would say Milan will have a good chance of fighting for the title.
Now I don't know how many Milan players will not leave the team and how many will be signed. Milan is lucky to have the first ones: Cremonese, Lecce, Bologna and Udinese. If they win these 4 games, and then manage to beat Napoli then they will be well on their way to fighting for the title.