With the cap shrinking, I think players like Rondo might have an easier opportunity of landing max-type contracts (or near that) with the simple reason that the vets that might get max-level contracts are a lot more expensive, so a player like Rondo might fit their budget more, even if they are overpaying for him.
So while the big dogs are making 16+ 18+ million dollars, you might as well just bite the bullet with Rondo at around 12 million next year, and leave some space for other possible acquisitions.