So I do not believe that Marseille is going to lose this match. Troyes is going to be confident because they are coming on the back of a win recently. But their last opponent was a team in the relegation zone. So this match is going to be harder compared to the last one.
There is no guarantee that the stronger team will always win the match. in this case Troyes vs Marseille, on paper after all Marseille is better than Troyes and everyone knows that. but when on the field later, anything can happen, including Troyes being able to overthrow Marseille.
But anyway, i agree with you. supposedly, this match is not a difficult match for Marseille to win. moreover, from H2H history, Marseille has always dominated every meeting of these two teams. besides, Igor Tudor is currently only focusing his squad on Ligue 1. Marseille is aiming for victory, to catch up on the point difference from the top standings and is only 4 points adrift of Lens which is ranked 2nd in Ligue 1.
As for Troyes, even though they play as home team. even so, to keep up with the players from Igor Tudor's squad seems very difficult. but, that doesn't mean that Troyes can easily be overthrown by Marseille.
Troyes also had a winning match in their previous match, and used that as motivation against Marseille at their own base.