I do not agree that Peca is the heart of the Buffalo Sabres. Sure he had a few good goals and hits here and there, but that doesn't make him the team's heart.
I don't think the Sabres need him to do well. They are doing just fine without him.
In fact, the Buffalo Sabres need more players like J.P. Dumont, who go out and score goals. Players like him get the job done.
So in conclusion, I think the Sabres are doing even better without Michael Peca.