It's very true, Inter is in the UCL, and will play Vida in another week, however I agree with you that it will take away energy from Serie A, while Napoli will be more rested and with more energy to focus only on Serie A, therefore the team for me will get much stronger and in better shape, Inzhagi's Inter is a team that has everything to win both tournaments, however consistency is something that the leading teams in these tournaments of all leagues are suffering from.
Reluctantly i must say that Inter can succeed in the company. Let's say that as a team is very well, he turns perfectly but already for at least two years.
Such a team can safely go to the Champions League final and also play the Scudetto.
Let's say that his strength is the fact that he is constant in what he does
Compared to other teams in serie A this season, intermilan does have a difficult journey not only because they are competing for the scudetto, but they also need to keep their chances in the champions league and also the coppa italia, in the coppa italia they managed to reach the semifinals and at least that gives them a little space to think about and face napoli and feyenoord in the next match, The match against Napoli will definitely be an opportunity for them to maintain the top of the current standings although Napoli may benefit from more rest time than Intermilan, but I don't think it will have too much impact on Intermilan performance later because after all they have a fairly qualified squad depth, so with the right rotation of course Inzaghi can still balance his squad later.