Copying my comment from another post with the same trade:

Sabres are probably not interested for a couple of reasons.
1) They have a log jam at LD and are probably looking for a defensively minded RD to pair with Power. Speaking of Power him and Dahlin are going to probably getting signed to 8-year deals this offseason (8x10 and 8x8.5 or something) so do they really want to add another guy who is also in need of his big contract at 26.
2) Krebs has been coming into his own and has definitely rounded out his defensive game this year. He is also cost controlled for a while.

I'd rather JJ or Kulich 2nd Line LW and Mitts 3C.

I understand all of these points and considered them myself, the way I see it is that Krebs is most likely the odd man out the Centre prospects that Buffalo has coming (Kulich, Savoie, Ostlund), so moving him for a Dman would be in their best interest since it is definitely the position they are most lacking at currently.

I see your point but an offensive minded LHD is not going to be the add. GMKA and Donny Meatballs seem to have the philosophy of letting the kids play and they really like Krebs, I doubt he is getting moved. Also it looks like the Sabres are going to run the same forwards group minus Olofsso next year.