Have you not learned anything from the 2008 financial crisis? TBTF will say or do ANYTHING for a buck, IRREGARDLESS of what the law says, especially when you have a Gov feeding at their trough. That much is certain. Bank on it!
Being you have been around awhile I am surprised how you think WAMU was worth 299 billion. You should do some research and factor in the Liabilities and not just the Assets.
With regard to the purchase price JPM actually recorded the purchase in 2008 and actually recorded a 1.9 billion exrtaordinary gain on the purchase. This puts a damper for those expecting JPM to be making any filnal payments. Which if it was true JPM would have mentioned in thier 10k's and created a reserve within the 9 plus years since purchase.
Look at page 124 of the link below which explains the WAMU purchase.