Update, per a story at PFT, the salary dumping that both Dallas and Washington did during the uncapped year is the big issue. Evidently teams were notified "6 times" that they were not to take advantage of the uncapped year to salary dump. All four did, but Oakland and New Orleans not so much.
Washington and Dallas have cap being removed, and those dollars are being spread out to the other teams....except Oakland and New Orleans who won't get cap taken, but won't get a share of the Washington and Dallas cap help.