Don Pacifico i actually think Saka is a Sanchez level player if not even better.
There is something else happening - he has a ton of defensive work that he has to do. Both him and Martinelli. If you compare their defensive data to other young forwards in the league, you see how much more work they put in. It's in line with our level of control and how our games have much less of a ping-pong rhythm than those of other teams.
Two ways to get around this
1) Find ways to get more protection from midfield, e.g., replace Partey with Merino, and then put Rice behind Saka as a protector
2) Power up... run Saka like this for 60 minutes, but then be able to bring a Diaz or Jota on for the final 30.