Ristolainen plays an absurd amount of minutes sometimes, too. Last year, Risto was 8th in the NHL in average ES TOI per game. The year prior he was 6th, and the year before that 15th. Over the last several seasons, he's arguably played some of the toughest minutes of any D in the league in addition to playing a ton of them. Is he better than all the guys who played less than him?
Minutes don't necessarily directly correlate with quality of play, except maybe as relative to teammates. Especially true on teams that have 0 blue line depth (a feature the current Stars and Sabres of years past share).