Ethereum is totally scammed coin and they are just experimenting the price at the market to attract more traders to buy ethereum then once they are satiesfied even a small pump they are gradually dump it.. its obvious if you notice the movement of the price.
Etheruem has been traded for 9 months. I think it could be distributed evenly among investors at the moment.
It is difficult to say. Some big believers will still hold most of their coins. The founder still holds 75% of this coins.