The good news is that Nathan knows this was wrong, is prepared to face the consequences and most importantly wants to put things right. I really hope that can happen, and is not just another 'ill do it at the weekend'. I hope it's taken seriously this time, and I think everyone wants to believe.
The track record you posted does not inspire confidence that he will actually "finally" do the right thing. It also explains the large dump on Polo today. I hope I'm wrong but you have painted him a serial liar and conman.
I googled 'Nathan Rixham' and feel a lot better about the future. Nathan seems to have sufficient skills and experience to make BTM a success, and that's more than most coin communities can say. The history of alt coin development has usually involved anon devs with modest skills and experience at best. Many have bitten off more than they could accomplish skill wise, so they walk away into the shadows. Sadly many more have been calculated scams involving premines, IPO's, and pump & dumps etc etc
I think it's clear Nathan Rixham had the skills and experience to pull off a large 2014 styled scam with an IPO and/or premine etc with ease, but he didn't. He could have easily avoided involving people who could later identify him, but he didn't. He could have left without disclosing anything in slack or on this forum, but he didn't, he's confessed to everything.
I really don't see anything going on here other than someone with a great idea, and talent & experience enough to complete the work, but obviously lacking things like time management, organisational skills, and sufficient resources to work without pay for months at a time, especially as there wasn't a BTM premine he could sell along the way.
Nathan could have pulled off a monumental scam in 2014 if he wanted to, but he didn't. He certainly made mistakes, and it sounds like his intentions can overtake his abilities sometimes, like borrowing money from friends when you can't repay them. I've got mates like that, always short of money, but still decent people, just unorganized with their finances. They're not scammers, just a pain in the ass, but often they're the best guys to know, coz they don't judge you back.
I'm still optimistic for bitmark, as long as Nathan & co re-group and get back to work asap.