The St. Louis Blues have a decent amount of depth on their blue line. The only issue they have right now is after their top six, there is not a ton of NHL experience.
Guys like Colton Parayko and Joel Edmundson took to the NHL like a fish to water, but some of the other prospects are coming along slower.
Jordan Schmaltz had yet to really see significant NHL minutes until late season injuries. Jake Walman looked like he had a lot of learning to do. Petteri Lindbohm has disappeared, through injury and other players passing him.