Yes, Juventus gets the advantage that they played against a weak team like Monza. So, they could get 3 points and lead the table now. Although it is still matchday 14, leading Serie A standings will boost the motivation the whole players to always perform with their best in each match.
I thought Vlahovic and Chiesa will score goals but it didn't happen. However, 2 goals made by Rabiot and Gatti is enough to get 3 points. Vlahovic and Chiesa seem to play better in the next matches, so the productivity of goals can be better.
It is true that Napoli will play against Inter Milan. Since the match will be at Napoli home, I think it won't be an easy match for Inter Milan. I guess Inter Milan has a chance to miss point in the upcoming match.
I don't think Monza is weakness opponent team for Juventus looking how difficult to get three points and need waiting until last minutes for scoring winning goals trough Federico Gatti. Actually Juventus have chance for winning above three goals but Dusan Vlahovic failed scoring goal from penalty kick on 11th minutes match begin. Crucial winning from Juventus on last minutes although they have lead awhile from Adrien Rabiot goal on 12th minutes but AC Monza success comeback on last minutes from Andrea Carboni goal on 92th minutes before Federico Gatti become man of the match for Juventus.
Its not really important with how Juventus crucial winning achievement because three points more enough move up to the first standings and waiting Inter Milan match result against Napoli. If Inter get chance miss three points will give advantage for Juventus keep on the top position place until next matchday.