I actually read over on Sherdog that Cro-Cop broke one of his ribs in the Kongo fight. Not sure if this is true but it would explain his uninspired attitude.
Cro Cop will be back. He is still one of the top fighters in the world (though it may not be at heavyweight). Cro Cop is pretty small now for a heavyweight, and looks like he's getting smaller each time. If its not too severe of a strain on him, he may even think about dropping to Light Heavy. That may be too much weight for him to drop at this time, but who knows.