In my opinion it's combination of all the things you mentioned and some whale market manipulation on top of it resulting into huge newbie panic selling. Also what are the current rumors of Wallstreet starting to get into BTC? This may be the best opportunity for all the big players to accumulate, really interesting to see which direction of the 10k $ BTC we'll be heading towards. The only thing I find a bit surprising on the timing of this correction is the fact all the major exchanges have been adding so many new users during the past weeks, but as I said the newbie panic selling is a big factor and majority of those new users are newbie "investors".
Solid post mate!