Edge
Kris King's Ghost
I think of Mike Knuble when I consider the possible ramifications of dealing Kreider. Of course the return would be key.
Knuble was a strange case, even by hockey power forward standards.
Was an older rookie; played for three teams and only scored double digit goals twice (never more than 15); and then suddenly at the age of 30, he puts together 8 scoring seasons, before his output falls off at age 39. Finishes his career in his 40s.
It's certainly possible and that's always part of the risk with drafting and developing certain players. You put in a lot of time, only for someone else to enjoy the benefit.