No, my theory is that EV is only a part of the problem and that players are very meh bar Messi.
And that a new coach won't improve this team mixed of too old players and bad new signings.
But, we will be able to see it soon.
A hint: prepare new alibies for those times, regarding our players.
Of course EV is just a part of the problem, his part is let's say around 90% or so.
Outstanding coaches, who know the language of football and the tongue of the players, who have a definite strategy, a vision and who are able to motivate them, have won trophies and played wonderful football
with players half of talent and quality of the present Barca squad.
Your
theory is damn wrong, and anyhow football is not a venue where theorizing would lead anywhere.
Sorry to step into your soul, but so far
alibis were almost single or highhandedly yours, when trying to be a born oracle for the future, based on bad and dull statistics on players, but missing the broad picture of STRATEGY and TACTICS all the time.
If you are watching the games, you can easily see that the team has a COLLECTIVE problem and NOT individual ones related to xyz player.
You are not capable of seeing that, you are not observing the collective culvert, so you try to theorize some absolute shit that still relates to the known agendas of yours.
Observe more, learn the tactical basics, write less and before all: refrain from foretelling the future, just for the sake to be right in at least some questions.