If Mbappe can now fully focus on his new role, he can gain great advantages for Real Madrid. It can be a good process for both Real Madrid and himself because his skills as a forward are very good. He also has finishing skills. Mbappe is a great player and I think he will get used to his position in time and continue to score goals.
Mbappe has good finishing skills and can convert key passes to goals at good rate but the striker position or central forward position will limit his performance for Real Madrid. At this position, Mbappe will not maximize his most powerful strength, his speed that is shown better if he plays at swing positions.
Ancelotti genius will be tested again, with the addition of injured defenders, the lack of rotation options complicating the situation within the team. However, we have seen last season, when Ancelotti managed to remove various concerns, this season it seems he will repeat it again.
This coach is good at it through his successful coach career and I believe he will go through this injury crisis in Real Madrid this season well too. Through his coach career, Carlo Ancelotti helped many players found new chapters for their career with entirely new positions where they became more successful than previous seasons.
Most likely, Real Madrid will not look for new players in the January transfer window, Ancelotti seems to prioritize maximizing the potential of the available players. We certainly realize that it is quite difficult to find quality defenders in the January transfer window, because every club will try to retain their players while the season is running. Besides that, Lucas Vasquez can of course be relied on, and it is possible that Ancelotti will experiment with other players.
Ancelotti and Real Madrid know that they will not be able to buy best defenders in winter transfer because such players belong to big clubs in Europe and these clubs never want to let their key defenders to leave in middle of season.
However, Ancelotti and Real Madrid will have to assess many things from now till December, to prepare for any need of finding tier-2 defenders for their team in winter transfer. Because the season is long, and if they are careless with player resource plan, they will pay expensive cost in decisive months of season.