Nope it cannot happen ever, before or after.
Scenario 1: An NSM SH voted for the merger and conversion to WMIH shares and then found out later that zillions more shares will be printed for WAMU escrows for which he/she has nothing to do with. How can he/she know if WMIH will overpay or underpay for those assets?
Scenario 2: Let say that those assets really bring value to WMIH but it was not disclosed. Now a WMIH SH may sell his/her shares cheaply at a dollar forty cents not knowing that hundreds of billions will flow into WMIH? Is it legal?
Scenario 3: in 2012, it was disclosed in SEC filings that all assets will be liquidated and the proceed returned in cash to those who signed release. I was one of them and now I find out that I will be paid with WMIH stock currency for which I have no idea of what I will get and if I will sell and others may do at the same time and the stock crashes, I may not have enough money to buy a hamburger let alone have HLCE.