The position taken in Enron's complaints was that the positions were tainted and that their holders should not receive a distribution from Enron's bankruptcy estate because a tainted claim cannot be washed via a transfer.
I worked on those complaints for Enron and published "On the Nature of the Transferred Bankruptcy Claim" for the University of Pennsylvania to answer questions posed to me repeatedly about related rulings and their implications.
Over the years there has been a fair volume of litigation, most of which has settled. Now and again there is a ruling. Recently the United States Court of Appeals for the Second Circuit handed down a ruling sure to be of interest to claims traders. I welcome related inquiries.