I may be in the minority of Habs fans, but I would do this if Buffalo adds a bit more. Assuming any of Vilardi, Glass, Mittlestadt or Pettersson are still there.
It's 100% guarantee that one of those listed above will be there at #8. The great thing about this draft is that the top 5 forward prospects in this draft are ALL centers. This is the perfect draft for the Habs to move up and get their 1C of the future. While none of them will be superstar top 10 center types there will be a good handful of future 60 point high high end 2C low end 1Cs.
Patrick and Hischier go top 2. Makar and Heiskanen are also going in the top 7. So with those 4 gone and only 3 picks left before #8 that means the Buffalo pick is guaranteed to be one of Vilardi, Mittelstadt, Glass, Rasmussen, Pettersson. So what else besides #8+37 for Sergachev? Buffalo could include one of Bailey or Baptiste, future top 9 forwards capable of 15-20 goals. They are quality prospects who have sure NHL futures.
8+37+Bailey/Baptiste+MIN 2nd for Sergachev. So a guarantee of a high end center prospect, two seconds and a quality winger prospect. I think Glass is the most likely available at 8 and he can be the answer to the Habs woes looking for a top line center. As for Reinhart for Sergachev Sabres pass. Reinharts already established and will be a future 65 point top center. No chance the Sabres would have dealt Reinhart for #9 last year to draft Sergachev. Reinhart was the #2 pick in 2014 and will develop into a 2 way 65-70 point center. Sergachev doesn't hold that value. He is more of a #2 dman, hence why I offered a first that will draft a similar prospect to Sergachev PLUS a high second, a late 2nd and a quality future 15-20 goal scoring NHL winger.
I'd rather trade Sergachev for an NHL-ready center in that case. Unless Bergevin is willing to do something drastic, the Habs are on the clock here. Not sure they can afford to wait a few years to develop a center, especially considering our track record in that department.
Not saying any of those names are available, or that a straight-up trade would do the trick, but if you trade Sergachev for someone young, I'd go after guys like Barzal, Strome, etc.
If you mean Dylan the yotes wouldn't move him for Sergachev. I doubt the Isles move Barzal for him either. The Habs are best getting and developing their future franchise center. A guy like Glass would be great, draft him as your future 1C, give him his d+1 back to juniors so he can dominate and go to the WJCs, then in his D+2 ease him in a 3C role and possibly by the end of the season he's in a top 6C role. By D+3 Glass is firmly a 2C and D+4/+5 at age ~22/23 he is likely fully developed as a 60-70 point high end center the Habs haven't had for years.