My $15.5 million in cap space includes Duren's cap hold and Robinson's full contract. Add those two up (19m + 14m) + my original $15.5 million in space, and you're right at $49 million in cap space.
Spotrac saying maximum includes Klintman and Reed still on the books for some reason. Technically, they could cut both and create even more cap space.
EDIT: Right around $56 million if Klintman and Reed were to be cut.