I'm not sure I agree that Krug is top 60 in the league, but I don't fault anyone who believes that. I will say that I am confident that Krug/Faulk are each low enough on the list that a top pair with both of them is not going to be good enough to give you an above average top pairing. I think that they are best suited as #2 and #3 guys if you are trying to be a contender, which is why paying each as a low end #1 makes constructing a good blue line around them so damn difficult.
The reason I think Krug is top 60 is because in the past 5 years he's established himself as a top 10 offensive defenseman and can play 20+ minutes per night. Even this past year he was ranked #17 in scoring among d-man despite having a down year offensively. Of course he has his flaws defensively, but I don't think he's
that bad, especially when you consider his size. I like Faulk's overall game more than Krug's, but since offense is such a premium in the NHL I'd say their market value is roughly the same. If I had to pick a number, I'd put them somewhere in the 30-50 range but of course others might see it differently. If Krug doesn't bounce back this year, then I might not say the same in the future though.
I guess time will tell if the Blues will be able to ice a good enough team and D corps with those two contracts on the books. I checked around the league and most contending teams spend roughly $25 million on defense and the Blues are right at that level. But if Parayko extends here, presumably for even more than Faulk and Krug, then we would be spending more money on our top 3 than most other teams around the league.
But landing a top d-man is not easy, so if we had not signed Krug or Faulk there is no guarantee we would have been able to acquire anyone better. Just glancing at the list of top d-men, they don't change teams very often or if they do they are very expensive via trade or free agency (guys like Hamilton, Jones, Ellis, OEL, Trouba, Petro, etc.). That's why I think Army jumped at the chance to lock down Krug and Faulk when the opportunity presented itself, because there is no guarantee a better option would have come along after that.