It looks like coinmarketcap changed the available supply to reflect that about 70% isn't in circulation. This seems consistent with removal of the CryptoID data you found showing the concentration of wealth in the top wallets of about 70%. Unfortunately, I feel this may help rather than hurt the scheme. BCC had been closing in on the top, having briefly passed DASH to make it to the #6 largest market cap (per CMC). Being pushed down the list likely gives the price more room to rise, without looking completely absurd.

They could be holding half in Bitcoin. They could have a sophisticated "trade bot". There could be an invisible pink unicorn orbiting Saturn. Unfortunately, these all must be relegated to the list of assertions lacking evidence that can only be believed on faith alone. At least Bernie Madoff released periodic audited financial statements purporting to show exactly how much was invested/held in cash/spent on overhead. These statements were false/fraudulent, but Bitconnect on the other hand has released no information whatsoever about their assets/liabilities/revenues/expenses/equity. It's a black box.

If some person setup an opaque cardboard box in the middle of the room that operated like Bitconnect, I would watch that one from a distance too. How much cash is in that box? Enough to pay everyone today? For a week? A month? A year? Only the organizer might know, and they're not telling.