Sancho is still too young to be regularly involved in the first team, also consider he hasn't played a full season of EDS yet.
Probably his trajectory should be something like this:
1) Next season he is 17 (and a half), should play full EDS and given the odd first team game against easier opposition (maybe like 2-3 like Woodburn gets)
2) Season after he will be 18 (and a half), should be integrated into team as a squad player, no more EDS, getting atleast 10 games in some capacity
3) Season after he will be 19 (and a half), has to battle for starting spot over other wingers, will be a squad player and should get atleast 15 games, has to push to be better or as good as Sane, Sterling, Roberts etc.