To your point #3, the most sincere and believable that Justin Sun has sounded to me was when he told witnesses during first chat after exchange takeover that (paraphrasing) he is "just a businessman, just wants to see the price of Steem raise high enough that he can sell his Steem and make a profit on his investment". That sounded like the truth to me. I don't believe he has any intention of further development of Steem beyond a pump and dump, made easier by a short powerdown which he will try to push through as soon as he is in control of the chain.