How do you think he compares to Foden? They have had similarly high expectations and were kept at their club rather than sent on loan at 17 or 18.
What stood out with Foden when I saw him at U16 sort of level was his decision making and the speed of it was phenomenal. He seems a bit faster and with quicker acceleration than Riggy. The physical side of Riggy's game, including tackling and defensive work-rate, are better though.