There is no special formula to win the league. Every winner goes through a dry spell or loses to 'inferior' opponents. Even in Conte's Scudetto season, we failed to win 4 of our first 7 games. In Mourinho's treble season, we couldn't beat 10th place Bari in either match. 19th placed Siena probably gave us two of our toughest games that season - once we needed to win 4-3 when being down 2-3 after 87 minutes, and the final match with the Milito winner - we also had a scare with them close to equalizing in that match.
I'm not trying to suggest that this Inter is as good as those two teams or anything like that, but just saying that you never know what will happen over a 9-month season. I remember last season, a lot of people also thought Milan would get their second star and Napoli would choke. I believe we beat Napoli in January and their lead was cut to only 5 points. But after that, both us and Milan fell into terrible runs where it seemed like neither team could beat anyone. Milan conceded 2 against Roma, 2 against Lecce, 4 against Lazio, 5 against Sassuolo, etc. We had that run where we couldn't score against anyone (three 1-0 home losses against Juventus, Fiorentina, Monza back to back).
I've been guilty of this myself as last season after the Salernitana/Monza matches (we got 1 point out of 6), I thought no way this team makes top 4. Our last 7 games of the season included Lazio, Roma, Sassuolo, Napoli, Atalanta, Torino. We couldn't score or beat anyone and I thought no way we make it. Yet we ended up with 7 wins out of 8, and this is with playing Correa almost every game.
Form changes very quickly in a season. Last season there was a period where it looked like we cannot beat anyone, but right after that, it looked like we could beat anyone, whether CL knockout game or a Serie A game, and that's with a lot of 'backup players' playing.
I also would not count out Juventus. They may not look particularly great but with no Europe, you never know. When they lost to Sassuolo, they looked awful. But 3 games after that, and they had 3 clean sheets, and are 2 points behind us. Not to mention Sassuolo, even when they sell players, generally are difficult for big teams.
I think as Inter fans, we always look at our team in a harsher way. When we beat Empoli 1-0, most comments are how we are out of form, we need to improve, etc. When Milan beats Genoa 1-0, it's mostly about how these are the wins that get you Scudetto. Same was said last season when Juventus had that period of 7 wins, most of them 1-0. The consensus are that it's what Scudetto winners do. I remember a lot of people thought they would actually beat Napoli in January (I thought the same was possible), and Napoli went and beat them 5-1.
This doesn't mean that we will win the Scudetto. Milan could win it, Juventus can win it, and so can we. We do have issues that we need to sort out but every team does or will over the course of a season. I think that for Inzaghi's style of play to work, rotation is very important. It's important that he starts trusting guys like Asllani, Klaassen, Augusto, etc. to start a number of matches. We don't want to end up having our main players out of form or tired and then rely on players who haven't had much of a chance to play.