I'm not sure I agree with the statement about Lampard getting the most out of young English players. I think he's been lucky that he's found himself with an embarrassment of riches at the Chelsea youth setup (thanks to Jody Morris and others) and he's used this to his advantage at Derby and then Chelsea.
I don't think Mason Mount, Callum Hudson-Odoi or Reece James would be any less talented under a different manager. In fact, they might excel under a manager with a stricter training regime and more tactical knowledge.
I like Lampard and enjoyed the entertainment level at Derby when he was in charge, but he gets a free pass from the media when he makes mistakes as a manager because "It's his first season in management"/"He's doing well with what he's been given"/"No one expects him to be doing so well"/"He's utilising young players"/"He's coping with a transfer embargo"... etc. The truth is, he's quite limited and I think it will show this season.
I don't think Chilwell will thrive or improve at Chelsea, but good luck to them all.