My hope is that sooner or later these NDAs will expire, and we can finally, and legally, hear the truth from our beloved developers. I hesitate to do any kind of guesswork until then. We'll never know.
Also, Posi had definitely said in that interview with Maressa that "no one person will ever really know why this happened."
There's likely a few things that they'll never be able to say without risking their reputation, unfortunately. I do recall that Melissa Bianco said she was completely caught off guard by the shutdown. Though I am sure some of them know more than others.
