Not quite sure who you are defending here ........
Are you saying the defence is ok - but the rest of the team is to attack minded thus leaving us exposed ?
Football isn't nearly as complicated as you suggest - some of the players in that defence aren't good enough,(Cuellar) , Cutis Davies has at times played very well , but is still young, and can not yet command a defence on his own. As you imply loosing Laursen was a big blow. But not unexpected - but the players MON brought in as cover Knight, Cuellar are some way short. Knight I can accept has a role as a squad player - however I see nothing in Cuellar to suggest he can cut it in the premier league - he's 28 as well - so he isn't that young.