I hear you but depth wasn't what caused the majority of TDs yesterday. Players were no where near open receivers. Every team has injuries but I've seen SC give up way more easy scores than they should and late in the season people even the second string should know their role. ir';s not like he thought he'd have a ton of depth so all of the players who could see action should be ready.
Those open receivers were there because of breakdowns in communication among the db's and lb's. A couple of the guys who are responsible for that communication and adjusting the defense to the offense were out. Now you have freshmen and sophomores taking on roles they aren't used to and no real experience to draw from.
If we were talking about juniors and seniors having those breakdowns, I'd be a lot more concerned. Considering that Wilcox has improved defenses everywhere he's been and how young he is, it's not likely that he suddenly forgot how to coach.