I don't really see the Foden comparison at all. Some even say he plays like Ødegaard which I don't think is true. He looks like a combo of Wilshere and Ramsey to me with his approach (the best aspect of both their games). His style is also similar to some of the best Hale End graduates like Saka, Nelson and obviously Wilshere. @MutableEarth compared him to Trae Coyle, a prospect who was also very highly rated and had a great first touch and robust physique, derailed by a plethora of injuries. Initially when he broke through I compared him to Rooney, but he doesn't have the overwhelming explosiveness of young Rooney. I even compared him to Joe Cole, but Cole had a bit more flair, Nwaneri does everything in an efficient manner, but still has some finesse sprinkled in. At times his technique reminds me a bit of Hazard, but don't know if that's a great comparison either.
Yeah I get your comparisons, you can see how special he is.
I think he has to evolve into an all-phase midfielder which would enhance his value and versatility on the pitch. He could contribute both defensively (his upper body is impressive) and offensively. This role would enable him to control the tempo of the game, link up play across all zones, and make decisions in various phases of the match.
The role of #10 will limit him and confine him to specific zones and responsibilities. He needs a broader role to maximize his skill set.