They, and everyone else Dubas added, were all good at limiting xGA. Acciari, Amadio, Kerfoot, Engvall, Rodrigues are all positive (negative) rel xGA/60 over the last 3 years. And Kampf used to be one of the best at that. ZAR was one of the best for years.Krok was good to before the got him.
I don't think those were eye test guys. Its too big of a coincidence that all of their forward additions were good at the same stat.
But using stats doesn't mean you aren't stupid, or know how to build a hockey team.