Of course, Napoli will also receive defeats and draws for the following matches, but I am sure that the bad results that Napoli will get will not continue to happen. Likewise with Inter's good results, at least Inter will not continue to win in all subsequent matches.
Biggest problem with clubs like Napoli is when they lose an excellent form, they usually start a slippery one and fail to reclaim their excellent form. Big and experienced teams often reclaim their excellent forms easily and shortly after losing their winning streak. It helps them to not lose their advantage too quickly and don't give opponents to much big hope.
Napoli have not shown many weaknesses this season. They have scored a lot of goals and haven't conceded many. So, my opinion is that they will continue to play well in the second half of the season.
I wish them luck but we can not say they are zero-weakness before the season ending. Lot of things can happen until season ending and the Scudetto competition is still going for all top clubs.
If the Juventus scandal is proven then not only Vlahovic will leave Juventus, but I'm sure all Juventus players will leave. In the past, when the Juventus scandal cost Juventus a penalty of being relegated to Serie B and the only players who remained as far as I know were Buffon and Del Piero.
They are players who are very loyal to the team, but in this era I am not sure that any Juventus player will stay if the scandal causes Juventus to receive another relegation penalty.
Worse, nowadays it is harder to find loyal players like Alex Del Piero, Gigi Buffon who shown their love to the club by sacrificing one season in Serie B with them. Nowadays, players are more interested in money, high salary and winning titles. They don't have much loyalty for a club they are playing.
If Vlahovic leaves Juventus, it would be a start of a domino effect. Other star players will leave and I am sure many big clubs around Europe welcome those players.