All I want from Olofsson this season is to be completely healthy and play ~80 games. He's been injured so much that couple of years it makes it hard to really get a feel for how he's progressed.
We're replacing Brodin with Scandella as a top 4 d-man, not really a big step down defensively. Scandella gets replace with Reilly/Prosser on the bottom pair, that is a big step down. But the bottom pair can play a more role, so it's manageable.
I'll feel much better if the bottom pair has Folin over Dumba. Prosser has looked like a passable d-man most of the year so far. Reilly/Folin I like as a 3rd pair, it gives some offensive upside. They have played together enough that Folin knows how to read off Reilly and play accordingly.
I can't recall what Olofsson's transition game is like. Reilly's was decent and he can handle the puck. That might be the deciding factor on who got called up.