Alexeyev is a prospect that is bordering on top 10 quality, his injury saw him fall a bit, he's great. Doubt hes there at 25 though, certainly don't hope the Leafs grab him. He possesses every tool you want in a number one D, skating, passing, Shooting, size, etc, he has it all.
Hes the only one out of this list that has no real weakness, the 2nd being Sandin, but he's smallish and his offensive upside is questionable.
Tychonick and Lundkvist are two others that might be near that spot and they're both well rounded, I'd pick them ahead of the rest of your list too.
As for the rest of the list, thats how I'd rank them:
Calen Addisson, he has all the strength of a typical smallish D, he's great, he's just tiny.
Jett Woo is an absolute brick of a player, he's one of the best at defending the neutral zone and he has some ability offensively, but he's likely never going to top 20ish points in the NHL and he'll be a serviceable type, not a player you pick 25 IMO. But I'm almost certain he makes the NHL and he steps up on people daily, love the player, just wish he was a bit more underrated so the Habs could snag him late 2nd.
Merkley, he has good skills, great in fact, perfect skating, good shot, great passing, but he's a nutcase on the ice and in the room, he has a case of either IDGAF at times, or he's really dumb as a player, maybe both. Upside is there though.
McIsaac has good tools, he's well rounded, but he's somewhat inconsistent and prone to mistakes, he's not a super smart player, he wont pull any great plays or what ever, and his offensive potential is limited.
K'andre Miller is dumb as rocks, he doesn't know how to defend, but he did just start to play D a few years ago. Guy has some good abilities though, but I doubt he makes the NHL. Still a gamble on tools like Merkley.
Mattias Samuelsson, is slow and lumbering, but he's smart, has a good shot, defends well, and yadda yadda, similar to Woo, just a slightly worst version. He's gonna make the NHL too IMO, just not an impact player, and I wish the Habs could pick him in the 3rd or something, but he's gonna get picked early.