I doubt he'll miss many, particularly due to red cards.
I'm not sure the model is have one season then sell them, to risk doing it all over again the next season.
He's not the finished article yet. He hopefully becomes that as our No1, over 2 - 3 years. If he leaves it's to one of England or Europe's elite clubs for daft money. Ideally in that same period we have established ourselves as a top half PL club and possibly European football. So if we are a stepping stone for players it's to the very top level.
Matty Young doing a couple of years in the Championship then back here. I've read reports from Darlington and Salford fans and the feedback is akin to Pickford and Young being a genuine generational talent.