Don't underestimate the partner effect. It's not always about one partner carrying the other so much as both trusting each other to be on a string so you can play your game confidently and not worry about looking like Justin Schultz. Goligoski was a fine partner for Klingberg, just as Marc Methot is for Erik Karlsson and Paul Martin is for Brent Burns.
Additionally, I haven't checked the numbers but he may have added two-way responsibilities. This happened with Dion Phaneuf, he was a Norris candidate when he was being used on a sheltered, basically second pair role. The next year he was used in a top pair shutdown role and looked like a mess.