I personally wanted Wallinder to step up in his bigger role in Grand Rapids last season, but he never really seemed to. He's a tall, toolsy guy that we're still waiting on to put it all together. He also seems kinda soft. I thought what little I saw of Buium live last season, he seemed pretty solid as a second pairing guy for GR, but did seem to make some mistakes in his own zone/neutral zone. Buium is probably the "closest" to the NHL of the three GR defense from last season in my mind, but Wallinder has a higher ceiling if everything clicks.
It's a shame Anton Johansson went back to play for his dad's team in Sweden because he seemed to do pretty well in his short Griffins stint last season.