They've been managed woefully. And from this bunch only Samper, Grimaldo, Halilovic, Palencia, Suarez, Adama, Sandro, and Munir are good prospects. The rest of the team is straight garbage.
That's 8 players. Should be plenty. At least two for every position. The lineup choices are simply baffling, though. Patric in midfield, Gumbau as first choice, Dongou not watching from the stands, constant reliance on two or three 9s when he has multiple wingers on the bench, etc, benching Samper, etc. The only good thing I can think that Vinyals has done is promote Palencia, who is a much better RB than Patric, but even that's only because Patric got moved to midfield, which itself was a terrible move (imo).