Sounds like completely the wrong bunch of people, from the most sinister and murky world of finance to be getting involved with Bitcoin mining. Ex-Lehman is everything Bitcoin is meant to be removing itself from. Also, and no discredit to Yifu, as I don't know what he's current intentions are with current orders, I can only presume he his trying to fulfil them, but he is not the engineering talent that kind of money would be investing in, surely??