Whilst I think there's definitely some validity to this point we have seen Jesus habitually miss chances since his very first game. Eddie is guilty of this. Just having a more reliable striker would make a difference, even if everything else remained equal.
The other obvious improvement would be teaching Saka to use his right foot and get to the one more often. Just adding this variety to his game would add another dimension to the entire team. His constant cutting inside does stifle opportunity.