If it's all the same I'll go with Mark on this one as he is probably the best source to know why he left, unless you have any evidence you wish to present to the contrary? You are entitled to your opinion but if you intend to state it as fact then you have to present evidence to back it up which you haven't done in your comment above.
In your latest blog you infer that the departure of Mark and Johnathan Dadley as a sign that they are getting out before CIG collapses -
"And some very talented people keep jumping out of the talent pool. Just last month, the much loved Mark Skelton resigned; Jonathan Dadley (yet another talented senior designer) is reported as also gone this month. And according to sources, several other high-profile (there is one particular person who, if/when he does leave, they should just shut everything down – immediately) team members are on the way out. While Chris and his friends are reportedly trying to entice and keep talent by offering copious amounts of money, they’re being laughed at and derided for the massive failure that he has turned the project into. In the coming months, my guess is that key people will continue to leave because, let’s face it, who wants to be part of this -show when it collapses?"
In reality both guys have left for perfectly valid reasons that have nothing to do with the state of SC's development or its impending collapse.
Mark left because of the travel -
https://forums.robertsspaceindustries.com/discussion/330905/gold-shirt-goodbye/p1
Jon left to pursue another role more in line with his interests -
https://twitter.com/JonDadley/status/745897657135206400
In fact you have been implying that CIG are going to collapse since at least the departure of Travis Day in June 2015. He left to become a Senior Producer at Blizzard, also a perfectly valid reason for leaving that has nothing to do with CIG collapsing.