Who said anything about resting Busquets? He took a deliberate yellow card to get rested next liga game. Only argument there would be if he was close to getting a red, which he wasn't.
Pedri looks tired after all these games and he is important to our game. He should have been given a rest at halftime for sure.
Dembele was having a pretty decent game but it was good to sub him anyway.
Griezmann and braith show no sign of fatigue, but would it really hinder our chances against elche if one of them got subbed by, let's say konrad?
I wouldn't like Dest to be risked at this point.
Edit:
About Koeman, we are doing exactly as I expected we would.
Top 3-4 spot in the league, copa del ray contenders.
As for cl, if we get past this round, it would be beyond my expectations. So I would say 8/10 with this current squad and circumstances.