The team says they are going in with the expectation of winning a stage. IMO this is a realistic expectation.
However should Alberto find he can compete with the heavy hitters his expectations will change

. If he can't and targets stages there is no shame in Winning stages, those are still Wins you know! The man rides to win and a stage win is a Win. More Glory than dragging in in the top 10 IMO. Either way the race will know he is there

.
EDIT: The supporting team is not strong enough for him to win the overall unless quite a few other riders fail miserably.....