It doesn't look like they're that far off. All three should be fixable, those moments smoothed off by repetition and experience.
Jokiharju also got 60% O-zone starts. It's a lot easier to defend when the play starts at the other end of the ice unless you have Sammi Salo in net.
Right at the moment, I don't think any of them have been particularly good. It seems most nights there is someone who has screwed up badly. I haven't brought myself to go watch the Flyers game because... ewww, Flyers win. Nobody needs that. (Insert, don't put that evil on me gif here).
I'd like to see Ruff get more out of his d-zone play, sure.
I have concerns about Power after having watched him now for parts of six seasons that it is just not there when it comes to the urgency of getting into defensive competitions - again this has NOTHING TO DO WITH HITTING - but everything to do with closing on his man to disrupt someone, getting inside position to block them off from having easy possession around the net, or pinning people out along the boards just by leaning on them. That last bit he's seemed to get better at. I don't think Wilford is the guy to get that out of him. If I was Ruff, I would be looking for the next defense whisperer assistant coach.
I have concerns with Dahlin that he can't channel the feisty parts of his game yet, that he switches off thought and even sometimes effort. It may be part of his usage - all those minutes do lend to wanting to conserve energy - but the times I see him at his offensive blueline sort of half-assing it back for a loose puck that someone on the other team blows past him to get is getting pretty high.