After his horrid displays at Arsenal, I do not know who in their right mind would want him. But I have seen many other cases of inept defending that were orignated by personal shortcomings. I do believe that Cygan would be wanted by clubs such as Crystal Palace, because they lack players with top club level experiance. Even though he is excessively blunder prone, I'm sure a few sides in the EPL would want him. That, IMO, is just the state of the defenses in England, absolutely wretched.
That type of performance from Ledley King is not one in a million either, he is not the player many think of him to be. He finds himself in trouble against the top clubs in the EPL far too often.
I would love to see how Cygan and King perform in the Serie A. The latter might actually be very good, because the quality level of the defenders he would play with would most likely be higher. That's the difference.