I don't know how many times do I need to say this but the focus should be Ajax 18/19 not ''your belief'' because the argument started with trying to replicate the Ajax 18/19 midfield. In 18/19, ten Hag managed to make it work a system of no 6 played with no 6. So basically, not no 6. has to be played alongside no 8.
Ajax 18/19 played very different in comparison to usual 433 or 4231 or even Barcelona 433. So even if you use Xavi and Busquets example or Alonso and Khedira in Real Madrid, it doesn't support your argument at all because Ajax 18/19 is just different than the others. Schone's role in 18/19 is the discipline role as he doesn't get as much as freedom as FDJ and doing less work in dictating the tempo. Schone positioned himself like a deeplying midfielder position as shown in the pictures I showed you before. You are stuck in your ''belief'' of no 6 should have be played alongside no 8 to compliment each other so you thought Schone role was more no 8 when in reality it's not. FDJ's role was just much much deeper than a normal deep-lying midfielder, which is why you thought Schone gets license to go forward but in reality that it wasn't Schone gets license to go forward but FDJ was allowed to move deeper than centre back like a modern Libero.
And also I would like add this as well about ''your belief'' that no 6 should be played with no 8 to compliment each other. Xavi wouldn't be complimeneted if he plays with Pirlo because one of them must be sacrificed as both players assets are dictating the tempo and midfield. Therefore, De Jong wouldn't even be better complimeneted by Xavi and Modric because these players like to dictate the tempo or to be specifically, one of De Jong or Xavi/Modric would need to be sacrificed. Therefore, it's about the manager's instruction on the player and whether they can execute the instruction.
On contrary to Busquets and Xavi, it wouldn't be a big deal to take away Busquets's ability to dictate because he still has his defensive aspect to offer. This why I said if ETH is going to replicate that Ajax 18/19, we would only need someone who is comfortable to pass the ball with one touch from deep area without giving the ball away cheaply, can still keep it simple rather than be complicated on the ball, has good positioning, and willing to stay deep to provide balance for FDJ. That's what Schone as no 6 did in 18/19 and also why I picked Kamara originally because he's capable to do those instructions.