Indeed. We have no reason to claim whether he is suitable for Real Madrid or not, he still didn't play in any match for Real Madrid. Arda needs to prove his quality in some matches for Real Madrid. Although he is a very skillful player, it doesn't guarantee he will be suitable to play with Real Madrid main squad. But we also has no reason to claim he will fail as long as he didn't show it in any match.
I think Real Madrid needs to prepare first before actually becoming a main player We don't underestimate his abilities but his experience is still not enough competition in local leagues is certainly different from in La Liga so he needs further adaptation, as a substitute may be the right way to provide experience and adaptation. When the time comes he will be in the main squad as a starter, we certainly still remember how Messi started his career at Barcelona and this player may also have gone through the same process.
Since coming to Madrid Arda has been really unlucky actually because if you look at what is happening right now Arda is often in the treatment room which makes him experience a slightly complicated situation for himself and Madrid.
Actually in this case Ancelotti is not too pushy and prefers to wait for Arda to get well first but there are concerns of course even though his age is currently still very young but talking about the situation he came with an injury problem of course this reminds me of Hazard.
He needs to fully recover and make a good debut at Madrid because that's how he'll be considered at Madrid. Even though Madrid are still waiting for Arda's full recovery but still if he continues like this and cannot strengthen his body then the opportunity at Madrid could be completely lost in Madrid which makes the situation and the potential that exists in Arda Guller the worst.