I see John Stones still as a player of much potential, but that's it. He plays the ball fantastically and is in with Martinez's pass it around style - however how often does he get turned out by an average player (you don't need to look far for an answer, Watford is the most recent).
To reject £30,000,000, just to prove that we are not a "selling club" would be stupid.
Would Stones walk into the Chelsea squad? I don't think so.
It would be stupid because we have no reason to sell, his value given recent transfers is about £20m on top of that and the buying club are desperate and have more money than sense....