I'm happy to see Juventus race for the first place in the Serie A because I was predicting to see Juventus win the Serie A and I can even bet on this team because I'm totally sure that Juventus is in the good form enough and because of not playing in the Champions League like other teams do, they can have higher chance compared to Inter Milan.
Don't underestimate Inter Milan. They are also in a good condition this season. If we consider the squad quality, I think Inter Milan is a bit better than Juventus. However, Juventus can focus for the domestic competition, meanwhile Inter Milan has UCL matches. They also qualify for the knock-out phase, which means Inter Milan will have busy day in UCL against stronger teams. This is the advantage for Juventus because they only need to focus on Serie A matches. Their players must have a better preparation due to a longer time for resting. However, since Inter Milan is leading the table, they still have a higher chance to win it.
Juventus are not playing in many competitions this season so it is advantageous for them to focus on Serie A and can also avoid player fatigue and injuries.
Yes, it can minimize the chance for injury and fatigue. But it doesn't guarantee that Juventus players will play better in the match. They only have the advantage in the physical side.