From wmitrust.com, not some general overview document. The following may clear your confusion.
LTA = ALL Debtor assets
On ED only CERTAIN assets were transferred!!!
2. What are the Liquidating Trust Assets?
The assets that are to be held and distributed by the Liquidating Trust (the “Liquidating Trust Assets”) comprise all of the assets of Washington Mutual, Inc. (“WMI”) and WMI Investment Corp. (“WMI Investment” and together with WMI, the “Debtors”)) as of March 19, 2012 (the “Effective Date”),
On March 19, 2012 (the "Effective Date"), the Plan became effective and certain of the Debtors' assets were transferred to a newly formed Delaware liquidating trust (the "WMI Liquidating Trust") as further described in the Plan. To view a copy of the Form 8-K that was filed by WMI (which changed its name to WMI Holdings Corp. on the Effective Date) with the SEC on the Effective Date, please click here.