WaMu wants nothing more than what it should have received in the first place.
Coming back, IMO, is not what they are looking for.
They want just pay, for the "business" that was sold.
There will probably be a WMI in some form or fashion, but not in the manner in which they operated before the theft.
WaMu wasn't as "dumb" as the press, the FDIC, or JPM makes them out to be...if they were, they wouldn't have spent over a billion dollars on new branches.
They were using the monies from the "bad loan practices" to build more and more branches so when the bottom dropped out of the housing market (every one knew it was gonna pop), they would have plenty deposits on hand to take care of the difference.
Just my opinion from my minuscule understanding of the financial institutions.