You can credit that fullness to Tom Schuman. He is a monster keyboardist who doesn't get a lot of attention but is one of the best I've ever heard. Mitchel Forman is another monster keyboardist but that's another band and another thread.
I do credit Tom Schuman for that fullness on that recording. take out the keys and that song is empty. Scott fills it up some, but not the way Tom does. I have to agree with you, Tom is a monster keyboardist. Its too bad he doesnt get the attention he deserves, like Jordin Rudas or others do.
As for Joel Roseblatt, yes it was pretty recent that he's left the band. And as I understand it, it was not an ammicable departure. Anyway, they have a new drummer named Ludwig Afonso (a Cuban-American from Miami). He's not quite on Joels level but he's pretty good.