Real Madrid and ancelotti indeed have a lot of players on their squad but one thing am certain about is that no matter what they will definitely feel the impact of the Toni Kross even if it's not for long. Toni Kross was a master class in that midfield and I don't think they can easily fill his shoes but although football has seen alot of his type and they have all left so definitely something is going to be done to meet the space.
Yes the importance of having Toni Kroos will be felt even with the major signings that the club is currently doing, but it is clear that Madrid wouldn’t be hit with a sub par performance due to a players departure because they always have a someone to fill the void. When Kross announced his retirement Madrid who were hesitant to actually give Modric an new contract moved immediately to get to stay for at least a season because they know that losing both players in same transfer window will be a huge blow for them. This are little things that makes Perez and Madrid standout in the midst of others.
Also you can’t blame the likes of Barcelona who are really not in a position to challenge Madrid with better signings due to their financial constraints. For now all Barca fans might have to painfully watch Madrid take the center stage for now and hopes their own club gets his financial strength back again.