He failed to get up with a team that had Pena, Akieme, Correa, Araujo, Monhcu, Konrad, Iliax, Nico, Manaj etc.
Those are not all youth players and that is a lot of talent and expensive talent for that level with him being highest paid coach.
Those players and players he had are about age B teams will always be.
Excuse my ignorance, who is Correa?
I can't deny that the team had a lot of talent and a higher budget than it's rivals, but at the same time the goal is to develop first and promote second. Ideally you have both, and it is not as if the team did not almost achieve both.
If the budget had been built entirely for promotion and spending the same on a team with 8-10 years higher squad age and then not promoting from Segunda B, then being critical would be obvious.
So having all of those players does that mean he had them at the same time, and at the same time at the same level. Ilaix was only coming in at 16 during the 19/20 campaign while Nico was peripheral. Ilaix was moved to the A team in 20/21 while Nico promoted. Etc. Also players like Araujo and Manaj improved alot under Pimienta, along with fringe players like Dani Morer.
Don't forget that in the 19/20 playoff round that the squad for that mini tournament was messed about with Setien calling Araujo and Puig up and then not playing them, then Puig sticking with the first team while Araujo returned for the playoffs but wasn't really that good in the final.
And last season, a Semi loss on penalties which is a cointoss.