This is just nuts and irresponsible to Cro Cop's long-term health. The guy had nothing towards the end of his UFC run. Big whhe said himself that he was waiting until the last minuteoop that he stopped Mir's takedowns; he still got KO'd brutally by a guy that isn't near the top of the food chain. Schaub hasn't KO'd anyone since the Cro Cop KO and has a been highlight reel for many opponents. The worst loss of the bunch, IMO, was to Roy Nelson. Nelson is usually outclassed by his opponents if he can't land that overhand right. In the Cro Cop fight, Nelson actually took him down with ease and crucifixed him like nothing until the 2nd round horn sounded, then stalked and brutalized him the next round. It wasn't Roy's usual one lucky punch; he destroyed Cro Cop in multiple ways. That's not good for any HW in the UFC.
Cro Cop's legendary takedown defensive is gone, whatever BJJ Werdum taught him looks to have declined badly, his chin is gone, his speed is gone, and his mystique is gone. Bringing him back to the UFC would just cause him more brain damage.