What we're lacking in Stones is that physicality and aggression to his game, and from what we've seen of Harwood-Bellis, he brings it in bundles and the fact he's showing this at 17 whilst playing against fully grown men is very encouraging. This, combined with the fact he's very comfortable on the ball and is the build you look for in a CB (with plenty of time to grow given his age) makes him the most exciting prospect we have outside of Foden IMO. The fact that he's a blue is the icing on the cake.
I hope we put some serious stock in him. Should be getting some decent game time in the cups and in an ideal world a start in the PL before the end of the season.