Well, not neccecarely.
Serie a usually starts bad in CL cause the teams arent as progressed as many other teams are because they start so late.
From that point of view, if Conte decided Tevez-Vucinic is the best forward couple for the next month or two, it makes perfect sense he'll have both play as much as they can, so they are totally played in on each other, and prepared for championsleague.
If this theory stands, once Conte is pleased with the understanding between Tevecinic, he'll start rotating them with llorente in league games at first.
Another point would be the serie a. We have a rather difficult first 10 games set out. So putting as good players as possible, having them be at their best as early as possible, would give us more chances of getting the most points.