I can agree with you about this. Arda Guler is still 18 years old, it is too early claiming he will experience the same thing as Eden Hazard. Moreover, Arda Guler doesn't experience a too long injury as Eden Hazard. As far as I know, he already recovered from the injury. But he seems still waiting for the best time to play again. I assume Ancelotti doesn't want to take a big risk by suddenly put him on the lineup. Ancelotti lets him to sit on the bench first, Arda needs to ensure first his fitness. However, I think we will see him to play again in the near future. Maybe he will play in matchday 14, when Real Madrid against Cadiz.
Arda Guler still on the young age and he was automatically promotion to main squad difference when Real Madrid signed Vinicius Jr and he must play with junior teams firstly before promoting to main teams. I don't think with failure signing Arda Guller actually Carlo Ancelotti more patience waiting until he get recovery from injury and not hurry to play him with bigger risk later. Latest rumor looks not possibility for Arda Guller get first appearance with Real Madrid after getting injury again, looks he will waiting longer time to make debut with Real Madrid and hope he can recoveries from injury as soon possible.
I won't see Arda Guller will be the next Hazard more spending with injury and he hasn't more contributed to help Real Madrid winning many tittles, its too early when comparing injury Arda Guler with Hazard due still have many matches left in La Liga or Champion League.