Reason 2: I think the price is dumping because of its altcoin BCH.. Current BCH price pumping making peoples invest in bch inspite of btc.. people are thinking they will get more profit in bch. than btc.
Yes, you wrote in there a lot of possible theories but this is what is really happening right now.
Forget about the consequences of that bitcoin increased a lot during the last few days, if this issue with Roger Ver and his friends didn't came up, the price could probably be going up.
There has been a huge complot between Roger, Coinbase, Segwitx2 and his miner's friends.
Those are enough reasons to see the price going down, and to see bcash going up.