He needs more time in a settled team before i judge him too harshly. He probably doest speak a word of English, doesnt have a understanding with his centreback partner due to lack of game time together, probably needs a leader alongside him.
Bloated squad means less places in the match day team for the younger players. In Moyes time we had a small core bulked with youth. The bench regularly had kids on it, however only the special ones got a game regardless.