We see this kind of teams making surprising starts but the most important thing is to be consistent of course. Udinese might not be able to maintain a great performance for a very long time. Especially if the big teams in the league start to control the top positions Udinese's job will be much harder to fight for top 4. Even if they somehow fight for the sixth position for a spot in the Europa Conference League it would be a big success for them. Because they finished the previous season at the 12th position.
I am also surprised from their performance, but one thing is sure they are doing good and solid performance because beating teams like Roma, Inter and Fiorentina is not easy for any team, but they have done and having good performance at home with only one defeat which was against AC Milan in away match its dream start of the season but needs to be stayed like this is surely a big question mark specially in Italian League where we can expect big drop from any team without any reason is an usual business
But currently, as they are playing most chances they can do better until January then we can expect changes in positions because few teams are lacking of quality players due to injuries, and they are looking for better replacements in next winter transfer window which could be vital for all teams and their performance in this season.