He's scored 18 points but these will be exceptions to the rule as long as everyone is fit and getting minutes. Not everyone on this team can score big all the time. Look at tonight - Kyrie and Al out, that's a combined 49 points over the last 5 games between the 2 of them. Take 50 points off the table against a weak team, and you have Rozier and Brown scoring 26 in 30 mins, and Hayward 18. Tatum "only" scored 15, and Morris "only" scored 11. Put Kyrie and Al's 50 points back on the table and what happens to everyone else's scoring opportunities? They drop.
The way to look at this team is not the traditional metric of "need to score 20+ points", it's more like how San Antonio was when they won the championship in 2014:
Parker 16
Duncan 15
Kawhi 13
Ginobili 12
Belinelli 11
Mills 10
Diaw 9
Green 9
When playoff time comes our rotation will shorten and some people's numbers will go up while the end of rotation guys will drop. But during the regular season what I'm looking for from players isn't so much absolute numbers but efficiency - in this case Hayward was 6-10, he had 5 rebounds but zero assists. So still plenty for him to work on. Rozier was 9-13, 4-5 from 3, 8 rebounds, 6 assists...even if those numbers were halved because he played 20 mins instead of 30 I would still consider it a good performance. The most important number for me is the 125 points the entire team scored.