Got some insight from someone I know that is connected to the fighting saints.
"joona is an excellent defender, great on puck retrievals, great 1st pass
i love his game
i actually think the best style comp is like gus forsling. again not comparing what he will be/what his upside is, just the way he plays
every game you watch him and he doesn't do anything that's super exciting but he doesn't make mistakes"
"a little bit of a late bloomer from what i understand but he is coming into his own physically right now. really smooth, elite hockey IQ. he's a little bit of a tweener being a 6' guy who i don't think has elite offensive upside, but by the end of last season he was by far our best defenseman, and probably our best player overall"