Although it is not a legally binding document, it is related to legal actions that will take place in the near future. Letters of intent related to bankruptcy are required from those who choose to file. For many individuals who are facing financial hardships, bankruptcy is the best way to overcome these difficulties and make a fresh start with their finances.
I completely understand the smoke_and_mirrors dance producers have to perform to bring all sides to the middle, but when it comes to key talent attachments, if it's not verifiable, it doesn't exist. Bottom line, ditch the letters and let us pick up the phone and verify Mr. Jackman.