I think the issue with Stacey recently is that when in the final third, his final ball is lacking in quality, particularly in the crucial final phase of games. His energy, commitment and adherence to the game plan of creating overloads against tired defenders gets him into the right positions only for him to panic/overthink and screw up the final cross or pass.
Or as Parker would put it “in them moments you got to be icy cold and think and exploit them moments”. I don’t think Stacey was doing that last season.