I'm going to speak to Krug because he is a weird case.
I don't think there is a d-man that is better in the 5 on 4 situation at moving all over the zone and being able to run different looks and break down the opponents box. 1st in PP points this year and top 5 or better for most of the years prior to that. The Bruins were a mediocre powerplay with guys like Savard, Seguin, Horton, Bergeron, and Krejci. And then Krug came out of no-where as a college UFA, and since the Bruins have only had a lower PP% than the Pens and the Caps. He is a true difference maker at 5 on 4 and absolutely elite in that scenario.
But...
At 5 on 5? He is a volume shooter from the point with shot charts that look like a defensive defenseman pounding shots from his point position. He does not venture around the offensive zone like some of the other guys here adding a lot of 5 on 5 scoring.
Part of that is the Bruins being conservative by nature. Less so than under Julien, but they are still a very low event team. Some of it is that he just doesn't have the speed to get back if he is caught out of position. The net is that at even strength, Krug was outscored by his partner Brandon Carlo at 5 on 5 this season and really has never put up impressive numbers at even strength.
Not to say he doesn't have the offensive skill, but his limitations defensively, and the fact that he is on a team that is more interested in hiding those limitations than dealing with their cost means he has never been a big point guy at 5 on 5. At least in the regular season. In the playoffs, we have seen him add an extra gear in aggressiveness offensively when the points are harder to come by and his teammates back check if he does get caught have some more desperation. But, I am not sure that limited sample helps him so much here.
I still am going to put him in my top 10. But, I am not sure if he sure fire belongs in that group sure he is top 6 in points for a d-man over the past three (and four and five) years. And 8th this year. But at even strength he is down in the 40s with guys like Fowler and Severson. Not exactly Carlson, Josi or Makar. An elite elite role player. Of course, the points still count whenever you score them... but all things being equal, I think the guy that can do it 5 on 5 should have the edge.