If just Inter perform here like they do in Champions League, they will be in a better place! For Juve, I am pessimistic, nothing seems to be working well there..
Napoli is doing great so far in the other hand whether in CL or Serie A and I expect them to make a surprise if they can continue like that. 0 defeat after 9 rounds is impressive. For Milan, well, they are doing good also and might profit from a defeat of Napoli and Atalanta to jump in front of them.
This season is epic good and unpredictable

Optimistic with Inter can return back to top performance at domestic league after good perform on Champion League and almost one step closer to next round after got draw from Barcelona last match, just need time for Inter back to top fourth in few match later. Pessimistic with Juventus after drop at domestic league and champion league have poor performance and almost close chance can qualify to next round and left 5 points from 2rd position team.
No doubt with Napoli have perfect perform in this season and success lead 1st standing not only in domestic league but also unbeaten and won all 4 match at champion league. Absent on Europe competition give advantage for Atalanta because totally full focus on domestic league and until 9 games lead 2nd position standing left 2 points from Napoli.