Jalo and Nana

Sorry but have to disagree on Reuben. Absolute quality.(I'd argue the best at 15) playing against much older players and built like a 20yr old. His career went downhill when he was pushed too early. And then blighted by injury.
Some of the others you've quoted did not start their debuts such an early age as 15 like Rooney. Jalo is 16.
Hirsty and Best 17 going on 18. Still young I agree but many were built for it at that age.
I can see Dyer Getting some Game Time in the not too distant future given his talent and build.