Willock is 21 and we are talking about his game lacking the sort of midfield qualities that only come with experience. The guys not even fully developed physically, a couple of years and a bit more muscle and he'll be unreal.
We should be offering him a new deal in the summer not trying to sell.
We can generate value by selling players that are older anyway. Xhaka and Laca for instance still have value but we are going nowhere with them. 2 decent players but their time should up at Arsenal.