I wouldn’t go as far as that.
While he’s not hitting the heights of his form from Jan - Oct, he still for me, (even yesterday in one of his poorer games) shows far more skill, attacking intent, shots at goal and attacking threat than anybody else.
His impact definitely waned in the 2nd half, could have been something to do with his head injury, he was down for a long time and was heavily bandaged up when returning in 2nd half.
Yes we want to see more from him, but we would be significantly poorer IMO without him.