Thank you, Mr. Simpson, for reposting this.
The FDIC is suing on behalf of WAMU (and some other banks under FDIC receivership), not WMI. Proceeds will go to the WAMU waterfall at the FDIC, not the WMI waterfall; at least not until all WAMU creditors are paid, then anything that is left - might be nothing - would presumably go to the WMI estate, being administered by the LT.
No idea how much - if anything - will be left after the WAMU creditors are paid.
The complaint you linked was filed on March 14, 2014. So this litigation has been ongoing for five years already. The case number is
1:14-cv-01757-GHW in the SDNY.
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