It's still unclear whether Bergevin will retain the services of his first-round pick in 2018, but with the Montreal GM's current radio silence, it's hard to predict the future. There's talk of a 700% raise and a potential new long-term deal, which indicates which way it's leaning, right?
Anyway, regardless, the Sabres and Habs would not be on the verge of a deal including Jack Eichel, so this avenue must be "crossed off" of the plausible options in this matter.