This is exactly what Setien is doing - experimenting. These early CdR rounds are his pre-season.
a) Can Griezmann play as traditional ‘9’ in this system?
b) Can Frenkie operate as a lone pivot in this system?
c) Are Ansu, Perez, Puig ready to contribute?
e) Can Semedo operate as the lone wide player down the right flank? Is he a consistent enough attacking threat?
f) Can Roberto and Firpo do a job at CB if need be?
Any proper coach should experiment.
But do I think he now has a much better idea on what these players can/can’t do, and what this team needs in reinforcements and on the training ground? YES.
This teams needs deep cleansing emotionally, tactically, & physically (as in some player have to go) from years of mismanagement.
Patience.