Playing a double pivot where one of them is fecking Busquets is on him and only on him. Oh, but Frenkie is best in a double pivot, so fucking try another one there because it doesn't work. Small sample size or not it's the same shit Valverde did with Raki and Busquets over and over again and everyone knew it doesn't work. Being 5 games in should not count as an excuse.
Try putting Pjanic/Puig/Bob there. And if it still doesn't work, change the damn system to a 4-3-3, or 4-3-2-1(the Christmas tree). Will it work? Who knows but show some flexibility, show some insight into trying to counter the other team, try some other avenues. So far, exacerbated by the fact that he waits until the 80th minute to make a sub, koeman looks like a stubborn mule with very little and fixed ideas. Doesn't look good so far.
Edit: the 4-3-2-1 might work at times if Dest shows the same quality going forward. We can use Alba and Dest to provide wing play. I don't know, just throwing ideas out there but Koeman should change things here and there because continuing every damn game with the 4231 is not going to cut it.