I half agree regards Alcaraz, although I'm not sure if he beats KDH to that central role, and the wide roles are largely spoken for too.
Iroegbunam shows promise, but tbh Gana has been comfortably first choice in that role even at his advanced years.... that may be about to change. Armstrong is the classic "neat and tidy" at this point (which is good for his age), but again doesn't displace Garner or Gana as first choice. Again shows great promise. Dibling to displace N'daiye? Really? Again, I don't think so, and tbh the snippets we have seen haven't even shown that much promise yet.... hopefully that will change. Rohl shows some promise..... but again, who is he displacing on merit when everyone fit?
Aznou is a baby and is being kept out by an established (if workmanlike) international. I also have no idea about his defensive qualities.
Grealish's, Branthwaite's and Gana's injuries have opened up opportunities for all of those, but our form has generally dropped-off in their absence imo. Of course it's a moving scale with time, and some of those younger players are still improving.