Karim Benzema never got a chance of playing consistently in Real Madrid until Cristiano Ronaldo left th club. He was also used as a backup striker until he had the opportunity when the Portuguese international moved to Juventus. Arda Güler's time will also come if he is patient enough and he is also playing games sometimes. The young Turkish player is also blessed to be under one of the best coaches in the world. He would learn so much from Carlo Ancelotti's experience and tactics.
During Madrid have many top players looks difficukt for Arda Guler get regular position and get small minutes playing in last five games of Real Madrid. But its not classic problem in football during any teams have many top player make difficult for young player to be regular before any main player get injury.
I think not only with Arda Guler but also another young player Endrick get difficukt removing Kylian Mbappe position, he must play from the bench and have few minutes only for playing every match. Just waiting the right moment onky before Arda Guler become regular player if keep patience waiting for without moving to the other team.