I'm not criticizing you or anyone in particular, but I think this idea that Luke isn't a top prospect and is only being talked about because he has two brothers recently drafted and in the NHL is wrong. I could see the argument for Power, Clarke, and Edvinsson over Hughes. Lambos, not so sure. I don't think there's really a consensus on the order of those top three defensemen, so there are pros and cons to picking all of them first.
People will say Power doesn't have any elite tools, but being very good in a lot of areas and also being 6'6 often does result in a 1D. It might be hard for teams to pass up a player whose floor is somewhere around Parayko level. And with a few improvements, I don't see why something around Hedman level isn't a potential outcome. High floor, high ceiling.
Hughes is probably the best skater in draft. His acceleration and edges are both elite, as is his ability to get back defensively. It allows him to play a very aggressive game offensively because he recovers so well. Offensively, he doesn't have the pure offensive skills of Jack or Quinn, but I think he's a PP defenseman in the NHL, and maybe PP1. He has pretty underrated offensive skills and I like his instincts in the offensive end. I think there's a very realistic Heiskanen level ceiling in his game, and his floor is also pretty high as an elite skater who brings enough value in all three zones, at bare minimum to play top 4. Like with Power, his defensive game isn't bad right now, but it's more about potential than the current product. Once he learns the right balance in being aggressive offensively, his defensive game will improve. He also needs to get a lot stronger. He's not an instant NHL'er.
Clarke is the most dynamic of the three. He has the best puck skills, he has the best passing, shooting. His skating will get tagged as the weakest of the three, but the way he plays with how aggressive he is offensively with the plays he'll try to make going at defenders, it doesn't really play all that weak, at least against lower level competition. He attacks with his skating more than Power, and you could argue Hughes, although Hughes attacks with his skating in a different type of way. Hughes attacks with his skating to cover ground and be a number in the play as opposed to Clarke who attacks with his skating to directly create scoring chances. Defensively, I think he's at least average. Maybe he's a little better, but he plays a risky game. He probably has the lowest defensive potential of the three and his skating will probably be tagged as the worst of the three. I'm not sure either is a real weakness though.
Edvinsson, I would put him on a lower tier than the other three, but I can see the argument for him to be in that same tier. He combines puck skills, offensive instincts, along with good size and skating. He may not have Power's size or Clarke's offensive ability or Hughes skating, but a 6'4 defenseman who can skate and has good offensive ability is going to be picked high. The question surrounding him is how he processes the game and his defense. His game is very much more about his potential right now than the finished product. I do think though that there are more concerns with his game because he probably has the biggest weakness to answer to with his sense/defense of the four, and I'm not sure he has the one elite calling card. But certainly a pretty intriguing skill-set that will have him drafted pretty high.