Any team in the league with the cap space to take Risto, would take Risto. Period, end of, slam dunk.
Not a single one us us knows what he is worth in a trade, besides, duh, he is worth what an NHL GM will give for him. Besides top 6 center, top 4 RHD is the prime commodity if it appears on the market. Sabres are in the catbird seat, and can remain in the catbird seat until the trade deadline. Teams with significant D, or team D, deficiencies can hope that they can improve with what they have. When the mid-point of the year trade dealine rolls around and some teams are borderline playoffs, they can pay more at that point than they would now, that's fine. Because whatever you think about Risto, his price will be greater a few months from now that it is now.
As a Sabres fan who has been down on Risto for the past two years, I'm fine with him now. He is overpaid. He plays a valuable role on the team. I'd rather trade Montour, who all-in-all is a better Dman but can get (I think) a greater return, and, there is redundancy in his skillset with the current Sabres D.
Amd here's a true statement...It's early, but Jack Adams favorite Krueger is giving Risto the most minutes on the team, and so far so good. I don't think it's a Botts/Krueger conspiracy to boost a player's worth, Krueger just cares about winning and having a team grow and improve every single day.