Here we have to check few things before talking about Allegri and Juventus performance in early rounds of this season they have around 12 injuries which were not allowing them to have their best and things were worst for the team like Juventus which is surely well known by board and all fans but still Allegri done amazing job and keep his teams spirit high and as he has some recovery now they are back in business which is surely masterclass from them with this now they can fight hard for having their best result in this season even they are badly out of the Champions League but hopes high, and they still can do good in this season with their available resources with this all now fans and management is also feeling good.
Yes, we understand the condition of Juventus at that time, but it is sometimes unacceptable for most fans and staff who just want to win every matches. When I read the news about the deadline for Allegri, I thought that Juventus might make another mistake if they really sacked Allegri this season. I remember what AC Milan did, when they were down with Allegri, they sacked him and the downturn was not because Allegri couldn't train well, but Milan hard to buying good players who matched with Allegri strategy. IMO
One thing that must be credited to Allegri is that he kept the confidence to continue coaching despite the dire situation at the time, because there was a lot of pressure from several boards and also a lot of fans about wanting him to replace Allegri with another coach immediately. But according to rumors Juventus are indeed not willing to pay a high price for the sacking of Allegri, so maybe Juventus also can't do much other than continue to give full trust which is still given to Allegri.
Because after all, basically Juventus already has a good squad, it's just that many of Juventus' key players have suffered injuries and maybe, this is also one of the things that keeps Allegri's confidence good to continue coaching Juventus.
With an increase in Juventus' performance like this, at least Napoli, who might previously feel comfortable at the top of the standings, will be wary of him again, because any mistakes made will have a big impact on his position at the top of the standings.
Because being a strong team at the top of the standings is not easy, they have to be consistent to achieve good results in every match, but I don't think Napoli will be easy to drop points this season and this competition is becoming more interesting even though they still have a gap in points which is quite wide.