Yes, I agree with the h2h analysis you gave but their record also shows that in Napoli and Sassuolo meetings, Napoli has highest wins even though Sassuolo have recorded few wins against them. With the recent form of Napoli, the good performances and the high goal scoring rate the team has achieved so far I don't the beating Sassuolo will be difficult for them since none of their key player is sidelined for any injury or illness they will surely be the winner of the match at their home ground and a win against Sassuolo will keep them as League leaders with a record of 10 wins in 12 matches and 32 points.
Yes Napoli have always been above Sassuolo in their several meetings. Napoli's form now is much different from before, everyone must see that. Sassuolo also can't be said to be bad, it's just that they are still struggling to form their dream team. It becomes natural that many bet on Napoli because they are more promising to give a win for those who bet on Napoli.