ah yes your squad depth argument, lets spend 75 million on a squad player with gaping holes throughout our 1st team. This also the thread with your famous comparison to Phil Foden as a 'squad player' even though Foden racked nearly 3500 minutes of competitive 1st team football in the season in question as opposed to an actual squad player like Jesus at man city who hit 2800 minutes of competitive football. Like I said, embarrassing.So we can add squad depth to things you don't understand then. Also note that nowhere in the post you linked does it say Sancho would be the backup, you've just made that up.
Edit: omg I just looked at the thread, I even had to explain to you what squad depth and rotation is back then and you still don't understand. You're like the Liverpool fans version of Adam.